Detailed explanation of python basic learning

Run the first program hello_world.py

#_*_coding:utf-8_*_print("Hello world!")

Output result:

Hello world!

Variable

#_*_coding:utf-8_*_name = "beyoungt"

#_*_coding:utf-8_*_name = "beyoungt"print(name)

name = “abby"print(name)

Output result:

beyoungt
abby

The value of the variable can be modified at any time in the program, and python will always record the latest value of the variable.

String:

In python, everything enclosed in quotation marks is a string. Can be single or double quotes.

"This is a string."'This is also a string.'

Use method to change string case:

name = "beyoungt"print(name.title())

Output:

Beyoungt

title (): Change the first letter of each word to uppercase.

upper(): Change all strings to uppercase.

lower(): Change all strings to lowercase.

Concatenation of strings:

first_name = "tian"last_name = "beyoungt"full_name = first_name + " " + last_nameprint("Hello," + full_name.title+" ! " )

Output:

Hello，Tian Beyoungt!

Formatted output of string:

name = “beyoungt"print("my name is %s" %name)#输出：my name is beyoungt

%s: string %d: integer %f :Floating point number

name = input("name:")
age = int(input("age:") ) #integerjob = input("job:")
salary  = input("salary:")

info = '''-------- info of  %s  -----
Name:%s
Age:%d
Job:%s
Salary:%s''' % (name,name,age,job,salary)

info2 = '''-------- info of {_name}  -----
Name:{_name}
Age:{_age}
Job:{_job}
Salary:{_salary}'''.format(_name=name,
           _age=age,
           _job=job,
           _salary=salary)

info3 =  '''-------- info of {0} -----
Name:{0}
Age:{1}
Job:{2}
Salary:{3}'''.format(name,age,job,salary)print(info3)

Add tab character: \t

Add newline character: \n

print("Languages:\n\tPython\nC\n\tJavaScript")

输出：
Languages:
    Python
C
    JavaScript

Remove blanks:

favorite_language = "  python  "favorite_language.rstrip()    #删除末尾空白favorite_language.lstrip()    #删除开头空白favorite_language.strip()     #删除两端空白

Module:

#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenimport getpass

_username = 'burnywen'_password = '123456'username = input("username:")#password = getpass.getpass("password:")  #fails to work well in pycharm;password = input("password:")if _username == username and _password == password:print("Welcome user {name} login...".format(name=username))else:print("Invalid username or password!")

The getpass module makes passwords hidden.

Loop:

#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywencount = 0while True:print("count:",count)
    count +=1if count == 100:break

#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenfor i in range(0,10):if i <3:print("loop ",i)else :continueprint("oh....")

#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenfor i in range(10):print('----------',i)for j in range(10):print(j)if j >5:break

guess mini-games and improvements:

#！usr/bin/env python

#-*- coding:utf-8-*-

# Author burnywen

age_of_burnywen = 23for i in range(3):
    guess_age = int(input("guess age:") )if guess_age == age_of_burnywen :print("congratulations, you are right. ")breakelif guess_age > age_of_burnywen:print("think smaller...")else:print("think bigger...")else:print("you have tried too many times.")

 <br>

#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywen

age_of_burnywen = 23count = 0while count <3:
    guess_age = int(input("guess age:") )if guess_age == age_of_burnywen :print("congratulations, you are ringht. ")breakelif guess_age > age_of_burnywen:print("think smaller...")else:print("think bigger!")
    count +=1else:print("you have tried too many times.")

 <br>

#！usr/bin/env python#-*- coding:utf-8-*-# Author burnywenage_of_buruywen =23count = 0while count <3:
    guess_age = int(input("guess age:") )if guess_age == age_of_burnywen :print("congratulations, you are right. ")breakelif guess_age > age_of_burnywen:print("think smaller...")else:print("think bigger!")
    count +=1if count == 3:
        countine_confirm = input("do you want to keep guessing..?")if countine_confirm != 'n':  
            count =0else:print("you have tried too many times.")

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