Detailed explanation of examples of usage of Print() function in Python-Python Tutorial-php.cn

This article brings you relevant knowledge about Python, which mainly introduces the relevant knowledge about the usage of print() function. The print() function is used to print output. One of the most common built-in functions in Python, let’s take a look at it, I hope it will be helpful to everyone.

Detailed explanation of examples of usage of Print() function in Python

[Related recommendations: Python3 video tutorial ]

print() function is used to print output and is the most common in python A built-in function.

1. The syntax of the print() function is as follows:

print(*objects, sep=' ', end='\n', file=sys.stdout, flush= False)

Will print out "objects" to the text stream specified by the "file parameter", separated by the "sep parameter" and add the "end parameter" at the end. "sep", "end", "file" and "flush" must be given as keyword arguments. The flush keyword parameter was added after version 3.3 of Phthon.

All non-keyword parameters will be converted to strings as if str() were executed, and will be written to the stream with the "sep parameter" and the "end parameter" at the end . Both the "sep parameter" and the "end parameter" must be strings; they can also be "None", which means the default value is used. If no "objects parameter" is given, print() will only write the "end parameter".

　The "file parameter" must be an object with a write(string) method; if the parameter does not exist or is None, sys.stdout will be used. Because the arguments to be printed are converted to text strings, print() cannot be used with file objects in binary mode. For these objects, file.write(...) should be used instead. Whether the output is cached usually depends on the file, but if the flush keyword argument is True, the output stream is forced to be flushed.

2. Print() prints out text

The printed text content is not only Chinese text, but also English text or text containing special symbols. When printing text, you need to use quotation marks. The text content is quoted. The quotation marks can be single quotation marks (' '), double quotation marks (" "), triple quotation marks (""" """)

#Triple quotedA pair of triple quotes, quoting multiple lines of textMultilinetext="""must do as they can.

Usage method

Code

Running result

Single quotes

A pair of single quotes, double quotes can be used inside the single quotes, and the single quotes can be printed out

print('Where there is life, there is hope')

Where there is life, there is hope

##print('"Where there is life, there is hope"')

"Where there is life, there is hope"

#Double quotes

A pair of double quotes, single quotes can be used inside the double quotes, and the single quotes can be printed out

print("Never be discouraged!")

Never be discouraged!

print("'Never be discouraged! '")

'Never be discouraged! '

They who cannot do as they would,

must do as they can.

If you cannot do as you wish, you must do your best.

"""

print(Multilinetext)

hey who cannot do as they would,

If you can’t do what you want,

you must try your best.

3. How to use spaces in print()

#2Use commas between two adjacent items Intervalprint("It depends on people", "It depends on heaven", "If there is life, there is hope")It depends on people As long as there is success, there is hope in life##3##4comma Intervalprint ("It depends on people")If you plan things in people, you will succeed in heaven

4. Print() line break

The "end" parameter of the print() function specifies what symbol the print() function uses to indicate the end after printing the content. The default value is "\n" , indicating line break, that is, the print() function will automatically wrap the line after printing the specified content.

We can use other symbols to indicate the completion of print() output printing through the definition of the "end" parameter. For example: the "end" parameter of the print() function is specified as "|", that is, the print() function outputs "|" every time the output is completed.

Method		Code	Run result
##1	Put spaces directly in the quotation marks, there is no limit to the number of spaces	print("Planning depends on people, success depends on God, if there is life, there is hope")	Things depend on people, success depends on God. Where there is life, there is hope



Use a comma at the end of multiple lines	print ("It's up to people to make things happen",)	print ("It's up to heaven") It's up to people to make things happen, it's up to heaven	(2 There is a space between the strings)

When printing two or more adjacent lines, is not used	print("It depends on people"""It depends on heaven")	print ("It depends on God") print ("It depends on people") In the sky")	If you plan things in people, you will succeed in heaven

#5	No spaces between strings	print ("It depends on people" "It depends on God")	It’s up to people to make things happen (There is no space between the two strings)

##Run resultThere is life##No line breaks after printing, Use the end parameter to set the ending symbol you want Code##Operation resultscodeprint("Everything depends on God", end ="|")Operation results##1 2 3 4 5#5. The separator sep

Force newline
##Code	print("There is life\nThere is hope")
	There is hope


print("It depends on the person", end =" ")	print("Success depends on God", end =" ") print("If there is life, there is hope", end =" ")
If you plan for things to happen, it depends on God. If you have life, you will have hope.

print("It depends on the person" ,end ="\|")	print("If there is life, there is hope", end ="\|")
It’s up to people to make things happen\|It’s up to God to make things happen\|Where there is life there is hope\|
	##Code
for x in range(0, 6): print(x, end=' ')	for x in range(0, 6): print(x , end=',') Run result	0 1 2 3 4 5 0,1,2,3,4,5,

##Code	for x in range(1, 6): print( x, end=' ') print() for x in range(1, 6): print(x, end=',') print()
Run result	1,2,3,4,5,

Use the sep parameter to constrain the number of print brackets Separator between items Code##Operation results

print("It depends on the person", "Everything depends on God", "Where there is life, there is hope", sep ="&")

Planning is up to people & success is up to Heaven & as long as there is life, there is hope

#Code

print("www", "csdn", "net", sep=".")

Run results

www.csdn.net

6. Tab character\t

##Codefor i in range (1, 11):Running result1 2 3 4name = 'Adversity awake'print(name.title() " once said" ": " '\n\t"' saying '"')#Code##Run result##Codeprint("Student ID\t\tName\t\t\t\t\tSubject\t\tScore") print("100000102\tCameron Cameron\t\t\tChinese\t\t85")Run resultprint("%-10s\t %-30s\t %-10s\t %-10s"%("Student Number","Name"," Subject","score")) print("%-10s\t %-32s\t %-10s\t %-12s"%("100000101","Avatar","Chinese","80" )) print("%-10s\t %-26s\t %-10s\t %-12s"%("100000103","Monica Belluca Melon","Chinese","85 "))

Tab character\t controls the horizontal spacing. It functions like the tab key and controls the spacing distance when printing output

\t means empty 8 characters,
If the element occupies less than 8 characters, each column can be perfectly aligned, and everyone is happy;
If the character element occupies more than or equal to 8 characters, the alignment will appear Deviation, you can insert N pieces of \t to join them together, so that the elements can be aligned

or use formatted output. For details, please see the example

Code

print("You must try your best if you can't do what you want\t")

# #Running result

If you can’t do what you want, you must try your best

print(i,' \t',i*2,'\t',i*3,'\t',i*4)

2 4 6 8

##3 6 9 12

##4 8 12 16

5 10 15 20

6 12 18 24

##7 14 21 28

8 16 24 32

9 18 27 36

10 20 30 40

Code

saying="Man proposes, god disposes Man proposes, God disposes"

Running result

Adversity Awake once said:

“Man proposes, god disposes Man proposes, God disposes.”

#Error print() effect distance:

print("Student ID \tName\tSubject\tScore")

print("100000101\tAvatar\tChinese\t80")
print("100000102\tCameron Cameron\tChinese\t85")
print("100000103\tMonica Bellu Cameron\tChinese\t85")

# Alignment deviation

print(" 100000101\tAvatar\t\t\t\t\tChinese\t\t80")

print("100000103\tMonica Bellu Cameron\t\tChinese\t\t85")

#Use multiple tabs and keep the alignment intact

##Code

print("%-10s\t %-30s\t %-10s\t %-12s"%("100000102","Cameron Cameron","中文","82") )

Running result

#Alignment intact

Extra: Sometimes you need to align output, you can also use format() to achieve this:

7. Output mathematical expressions

If there is a mathematical expression in the brackets after print, the printed result will be the result of the final operation of the expression

Code

products=[["iphone",6888],["MacPro",14800],["coffee",32],["abc",2499],["Book",60],["Nike",699 ],["MacPro",45600],["coffee",432],["abc",244499],["Book",6230],["Nike",61299],["MacPro",14800], ["coffee",32],["abc",2499],["Book",60],["Nike",699]]

print("-"*10 "Product List" " -"*10)

i=0

for product in products:

print('{:<6}\t{:<10}\t {:<10}'.format(str(i), product[0], str(product[1])))

i = i 1

Run result

##print(8/1)Running results8.0##CodeRun results##CodeRun Result8

Print prints the value of the expression

Code

Print(1 2 3 4 5)

Run results

##Code

print(2*4)

print(18-10)

##Code

print(2 6)

##Run result

8. Print out backslashes\

9. Output of print() variables

No matter what type of data, including but not limited to: numerical type, Boolean type, list variable, dictionary variable...all can be passed through print() Direct output.

Print backslashes, put 2 backslashes together
Code	Print("If you can't do what you want\\you must do your best")
Operation results	If you can’t do what you want, you must try your best

##Code#Output tuple variableRun results(1, 2, 3, 4, 5, 'a', 'b', 'c')##Codeoperation result

Output of print() variable
Code	#Output numeric variable num = 91682 print(num)
Running result	91682

##Code	#Output string variable name = 'Sober in adversity' print(name)
Running results	Sobering up in adversity

Code	#Output list variable list = [1,2, 3,4,5,'a','b','c'] print(list)
Running result	[1, 2, 3, 4, 5, 'a', 'b', 'c']

	tuple = (1,2,3,4,5,'a','b','c') print(tuple)


#Output dictionary variable	dict ={'a':1, 'b':2,'c':3} print(dict)
{'a': 1, 'b': 2, 'c': 3}

10. Formatted output of print() data

##3Decimal variablei = 2670.5The number is 2670.500000% dot (.) followed by the field width; i = 2.671455738-bit reserved field width 2.671456##i = 2.67145573#4s='Sober in adversity'The length of the sober name in adversity is 4

Insert into the string		Code	Run result
1	String variable	name = "Sober in adversity" print("My name is %s " % name)	My name is Awake in Adversity

##2	Integer variable	age = 100 print("My age is %d"%(age) "years old")	My age He is 100 years old

		print("The number is %f" %i)

	% dot (.) Followed by the precision value; in the field width, the decimal point also occupies one place	print("8-bit reserved field Width %(i))

		print("The output with two decimal places is %.2f"%(i)) The output with two decimal places is 2.67

		#i= 2.6714563467 print( "a" ' .3f'%i) print("a" '%f'%i)	a 2.671 a2 .671456 (The precision is 3, so only .671 is displayed, and the specified width is 10, so 5 spaces are added to the left to reach a field width of 10 digits. In the field width, the decimal point also occupies one digit)

		x=len( s) print('The length of %s's name is %d' %(s,x))

##'{1, 2, 3}'#% c#%e, %Eprint('%e'%k)Binary integerprint(bin(50))0b110010%hu, %u, %luOutput integers of types short, int, and long in decimal and unsigned formprint('%u'P50#%ho, %o, %lo#%#ho, %#o, %#lo%hX, %X, %lXprint('%x'P)32# Outputs integers of types short, int, and long in hexadecimal, prefixed, and unsigned form. If x is lowercase, the output hexadecimal numbers and prefix are both lowercase; if X is uppercase, the output hexadecimal numbers and prefix are both uppercase. print('%#x'P)0x32#%f, %lf, %F# %g, %lg, %G, %lGprint('%g'%i)

Format output

Code

Run result

Output a string, characters The string is displayed using str()

i= 2.6714563467

print('%s'%i)

2.6714563467

#%r

Display of string (repr())

print('%r '%repr(set([1,1,2,3])))

Output a single character

print('%c'�)

Index (base e)

k= 2671.4563467284

print('%E'%k)

##2.671456e 03

2.671456E 03

#%b

#%hd, %d, %ld

Output integers of types short, int, and long in decimal and signed form

print('%d'P)

In octal, without prefix, Outputs integers of types short, int, and long in unsigned form

print('%o'P)

Output short in octal, prefixed, unsigned form , int, long type integer

##print('%#o'P)

0o62

#%hx, %x, %lx,

In hexadecimal , output short, int, long type integers in unprefixed and unsigned form. If x is lowercase, then the output hexadecimal numbers are also lowercase; if X is uppercase, then the output hexadecimal numbers are also uppercase.

#%#hx、%#x、%#lx、

%#hX、%#X、%#lX

print('%#X'P)

0X32

Output floating point numbers of type float and double in decimal form

i= 2.6714563467

print('%f'%i)

2.67146

outputs float or double type decimals in the shorter form of decimal or exponent, and the decimal part is No extra 0's are added at the end. If g is lowercase, e is also lowercase when output in exponential form; if G is uppercase, E is also uppercase when output in exponential form.

i= 2.6714563467

2.67146

##Run resultDecimal format 2671#CodeRunning result##Codeprint('Hexadecimal form''{:x}'.format(int(k)) )Run resultNumber form 2671.46##Codek= 2671.4563467284

print('Percent form''{:%}'.format(k))

#Code k= 2671.4563467284Run resultCodeRun result##Codeprint('Decimal floating point number''{:f}'.format(k))Run resultCodek= 2671.4563467284Output octal numberprint(oct(int(k)))0o5157

Some other format output methods
Code	k= 2671.4563467284 print('Binary form''{0:b}'.format(int(k)))
Run result	Binary form 101001101111

##Code	k= 2671.4563467284 print('Decimal form''{:d}'. format(int(k)))


k= 2671.4563467284	print('Otal form''{:o}'.format(int(k)))
Octal form 5157

k= 2671.4563467284
Hexadecimal form a6f
	##Code
k= 2671.4563467284 print('Number form''{:n}'.format(k))	##Running results


##Running results	Percent form 267145.634673%

	print('Power exponential form''{:e}'.format(k))
##Power exponent form 2.671456e 03

k= 2671.4563467284	print('Shorter decimal form Output''{:g}'.format(k))
In decimal and exponent The shorter form outputs 2671.46

k= 2671.4563467284
Decimal floating point number 2671.456347

Output binary number	print( bin(int(k))) ##Run result
0b101001101111
	##Code
k= 2671.4563467284	Run result


#Code	Output hexadecimal number k= 2671.4563467284 print(hex(int(k)))
Run results	0xa6f

Codename = 'Adversity awake'Run resultAdversity Awake#Code##Running result

## English case conversion (the first letter of title() is capitalized, upper() All uppercase, lower() all lowercase)

print(name.title())

name = 'Adversity awake'

print(name.upper())

ADVERSITY AWAKE

#Code

name = 'Adversity awake'

print(name.lower())

Run Result

adversity awake

11. Print() small example

11.1 Print characters

11.2

Print characters
Code	for u in range(1, 100): Print('{:c}'.format(int( u)),end =" \| ")
##Run result	\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| ! \| " \| # \| $ \| % \| & \| ' \| ( \| ) \| * \| \| , \| - \| . \| / \| 0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| : \| ; \| < \| = \| > \| ? \| @ \| A \| B \| C \| D \| E \| F \| G \| H \| I \| J \| K \| L \| M \| N \| O \| P \| Q \| R \| S \| T \| U \| V \| W \| [ \| \ \| ] \| ^ \| _ \| ` \| a \| b \| c \| 0b10

Multiplication table

Codefor i in range (1, 10):Run result1 *1=1##

11.3 Print solid diamond

Multiplication table
	for j in range(1, i 1): print("{}{}={}".format(j, i, i j), end=" ") print()
	12=2 22=4 13=3 23=6 33=9 14 =4 24=8 34=12 44=16 15=5 25=10 35=15 45=20 55=25 16=6 26=12 36=18 46=24 56=30 66=36 17=7 27=14 37=21 47=28 57=35 67=42 77=49 18=8 28=16 38=24 48= 32 58=40 68=48 78=56 88=64 19=9 29=18 39=27 49=36 59 =45 69=54 79=63 89=72 99=81

##n=5Run result *#11.4 Print hollow diamond

##Print solid diamond
Code	for i in range(1,n 1): print(" "(n-i) ""(2i-1)) for i in range(1,n): print(" "i ""( 2(n-i)-1))
	** * *** *** ****** * *** * *

Print hollow diamond##Codeprint(" "*(n-1) "*")operation result * *

n=5

for i in range(1, n):

print(" "*(n-1-i) "*" " "*(2*i-1) "*")

for i in range(1, n-1):

print(" "*i "*" " "*((n-1-i)*2-1) "*")

print(" "*(n-1) "*")

* *

* * *

* *

11.5 Print hollow triangle

#11.6

##Print hollow triangle
Code	n=5 print(" "(n-1) "") for i in range(2, n): print(" "(n-i) "" " "(2(i-1)-1) "") print(" "*n)
Run result	* * * * * * * * * * * * * *

Print solid triangle

Coden =5Run result *#

11.7 Print side triangle (6 types)

Print solid triangle
	m = 8 for i in range(0, n): for j in range(0, m): print (end=" ") m = m - 1 for j in range(0, i 1): print("* ", end=' ' ) print(" ")
	* * * * * * * * * * * * * * * *

## Method 2: ##Run results

##Print side triangle 1

Code

Method 1:

i = 5

while 0 < i < ;= 5:

j = 1

while j <= i:

print("* ", end = '')

j = 1

print(" ")

i -= 1

for i in range(0,5):

tx="◆"

print()

for k in range( 0,5):

if i>k:

continue

print(tx,end="")

◆◆◆◆◆

◆◆◆◆

◆◆◆

◆◆

◆

# Method 2: n = 5◆◆◆◆◆◆◆◆◆◆

Print side triangle 2
Code	Method 1: i = 1 while i <= 5: j = 1 while j <= i: .

print('\n'.join('◆' * i for i in range(1, n 1)))	Run results ##◆
◆◆◆◆
	Print side triangle 3

Code tx1=' ' ◆◆◆ ◆◆#

for i in range(0,5):

tx='◆'

print()

for j in range(0,5):

print(tx if i<=j else tx1,end="")

Run results

##◆◆◆◆◆

◆◆◆◆

◆

Print triangle 4
code	for i in range(0,5): tx='◆' tx1=' ' print() for j in range( 0,5): Print(tx if i<=j else tx1,end="")
Run result	◆◆◆◆◆ ◆◆◆◆ ◆◆◆ ◆◆ ◆

##◆◆◆◆◆◆◆◆◆##

#Print triangle 5
Code	l= 5 for i in range(l): for j in range(i): print(end='　') for k in range(2*(l-i)-1): print(end='◆') print()
Run results	◆◆◆◆◆◆◆ 　◆◆◆◆◆ 　◆◆◆ 　◆

#11.8 Printing parallelogram

Print triangle 6
Code	i = 1 while i <= 9: if i <= 5: print('◆ 'i) else: Print ('◆'(10 -i)) i = 1
	#◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆

Print parallelogramCodefor i in range(l): Running results

l = 5

for j in range(l-i):

print(end=' ')

for k in range(l):

print(end='◆')

print()

## ◆◆◆◆◆

◆◆◆◆◆

◆◆◆ ◆◆

◆◆◆◆◆

11.9 Use the letters word love to print a heart shape

11.10 用字符输出 I ❤ U （2款效果）

Use the letters word love to print a heart shape
Code	print('\n'.join([''.join([('Love'[(x-y) % len('Love')] if ( (x0.05)2 (y0.1)2-1)3-(x0.05)2(y0.1)*3 <= 0 else ' ') for x in range(-30, 30)]) for y in range(30, -30, -1)]))
Running result

用字符输出 I 爱 U （2款效果）

import time

y = 2.5

while y>=-1.6:

x = -3.0

while x<=4.0:

if (x*x y*y-1)**3<=3.6*x*x*y*y*y or (x>-2.4 and x<-2.1 and y<1.5 and y>-1) or (((x<2.5 and x>2.2)or(x>3.4 and x<3.7)) and y>-1 and y<1.5) or (y>-1 and y<-0.6 and x<3.7 and x>2.2):

print(' ',end="")

else:

print('*',end="")

x = 0.1

print()

time.sleep(0.25)

y -= 0.2

import time

y = 2.5

while y>=-1.6:

x = -3.0

while x<=4.0:

if (x*x y*y-1)**3<=3.6*x*x*y*y*y or (x>-2.4 and x<-2.1 and y<1.5 and y>-1) or (((x<2.5 and x>2.2)or(x>3.4 and x<3.7)) and y>-1 and y<1.5) or (y>-1 and y<-0.6 and x<3.7 and x>2.2):

print('*',end="")

else:

print(' ',end="")

x = 0.1

print()

time.sleep(0.25)

y -= 0.2

11.11 From Dear, I love you forever! Five words output five hearts

import time##

12. Print() Chinese input displays garbled characters

If there are Chinese characters in the code, python will report an error when running, and the Chinese cannot be input normally in python, garbled characters, etc.:

Compilation tip: SyntaxError: (unicode error) 'utf-8' codec can't decode byte 0x*** in position 0: ...

Mainly caused by encoding problems.

Affected by different development systems and environments, the solutions will be different, but generally the solution can be solved by following the following methods. If necessary, please try the solution that suits your own system: (Remember, the following You don’t need to add all the methods to the python file, just choose one or two of them to try, which can solve the problem)

In the first line of your python file (.py)

1. Add

16d72c9aa3ac3878a4b43bd6a3af54b5

When developing python, please note:

1. If you use pycharm Compile and write python code, pycharm will automatically save it in UTF-8 format by default. If you have modified it accidentally, please right-click on the pycharm work interface-File-Encoding-select UTF-8 encoding----reload- ----reload anyway. If that still doesn't work, try changing the path to all English.

　2. If you use other compilation and writing code tools, please click

Document>>Set File Encoding>>Unicode>>Unicode(UTF -8)

　3.If you use visual studio to compile and write python code,

　Python programming under visual studio 2022, an error will be reported: SyntaxError: (unicode error) 'utf-8' codec can't decode byte 0xc8 in position 0: invalid continuation byte

　Solution:

Save the Visual studio file Encoding changed to UTF-8:

##---->Unicode (UTF-8 with signature) - code page 65001

For other versions of visual studio, select "Advanced Save Options" in the file menu option

---->Unicode (UTF-8 with signature)- Code page 65001

Set the project character set to utf-8, select the project----right-click----Properties----add character set encoding

Visual Studio Community 2022 - UTF-8 codec issue #6784, please refer to reading:

https://github.com/microsoft /PTVS/issues/6784

## Digression: When making charts with matplotlib (pyplot), the title and axis The Chinese display will be abnormal and a small box will appear, which cannot be displayed normally. In this case, just add the following code to the header of the file:

Output five hearts, respectively from Dear I love you forever! Filled with five words.

sentence = "Dear, I love you forever!"

for char in sentence.split( ):

allChar = []

for y in range(12, -12, -1):

lst = []

lst_con = ''

for x in range(-30, 30):

formula = ((x*0.05)**2 (y*0.1)**2-1)**3 -(x*0.05)**2*(y*0.1)**3

if formula <= 0:

lst_con = char[(x) % len(char)]

else:

lst_con = ' '

lst.append(lst_con)

allChar = lst

print('\n '.join(allChar))

time.sleep(1)

#-*- coding: UTF-8 -*-

import matplotlib.pyplot as plt

import matplotlib as mpl

mpl.rcParams["font.sans-serif"]=["SimHei"]

mpl.rcParams["axes.unicode_minus"]=False

13. Print() writes to the file

Write the print content to the file.

Sometimes, we will encounter situations where we want to print content not only on the screen, but also saved in a file. Then, we can try to write the print content to the file as follows:

Create the test.py file and enter:

Write Input file
code	# coding=utf-8 print("Hello, World!", file=open('file.txt', 'w'))
##Running result	After running, a file.txt file appears in the directory where the test.py file is located. Open the file.txt file and you will find that the content inside is: Hello, World! means that our print() writes the file successfully.

#【Related recommendations:

Write file
Code	for i in range (1, 11): print(i,'\t',i2,'\t',i3,'\t',i*4,end='\ n',file=open('file.txt',mode ='a',encoding='utf-8'), flush=False)
Running results	After running, open the file.txt file and you will find that the content inside is: ##1 2 3 4 2 4 6 8 3 6 9 12 4 8 12 16 5 10 15 20 6 12 18 24 7 14 21 28 8 16 24 32 9 18 27 36 10 20 30 40 Indicates that our print() writes the file successfully.

Python3 video tutorial

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