How to use the print function in python

The syntax of the print function in python is "print(value1, value2, ..., sep=' ', end='\n', file=sys.stdout, flush=False)", where value1 , value2, etc. are the values ​​to be printed, sep is a string used to separate multiple values, the default is a space, end is the string appended at the end of printing, the default is a newline character, file is the output stream, the default is standard output Equipment and so on.

#In Python, the print function is a built-in function used to output specified content to the standard output device (usually the console). It is one of the most commonly used functions in Python and can be used to print text, variable values, the results of expressions, etc.

The basic usage of the print function is very simple. Its syntax is as follows:

print(value1, value2, ..., sep=' ', end='\n', file=sys. stdout, flush=False)

Among them, value1, value2, etc. are the values ​​to be printed, sep is a string used to separate multiple values, the default is a space, and end is the string appended at the end of printing , the default is a newline character, file is the output stream, and the default is the standard output device. flush is a Boolean value indicating whether to force the output stream to be refreshed. The default is False.

The following are some common usage examples of the print function:

1. Print string:

print("Hello, World!")

Output: Hello, World!

2. Print Variable value:

name = "Alice"
age = 25
print("Name:", name, "Age:", age)

Output: Name: Alice Age: 25

3. Print expression result:

x = 10
y = 5
print("Sum:", x + y)

Output: Sum: 15

4 . Separate multiple values:

a = 1
b = 2
c = 3
print(a, b, c, sep='|')

Output: 1|2|3

5. Custom terminator:

print("Hello", end=' ')
print("World!")

Output: Hello World!

6. Output to file:

with open('output.txt', 'w') as f:
    print("Hello, File!", file=f)

Output "Hello, File!" to a file named output.txt.

7. Force refresh of the output stream:

import time
for i in range(5):
    print(i, end=' ', flush=True)
    time.sleep(1)

Print a number every 1 second and refresh the output stream immediately.

It should be noted that there are some differences between the print function in Python 2.x and Python 3.x. In Python 2.x, print is a keyword rather than a function, so its usage is slightly different. In Python 3.x, the print function is a built-in function that uses parentheses to enclose the content to be printed.

In addition, the print function also supports advanced usage such as formatting output and controlling output alignment and color. These functions can be achieved through the use of format strings, escape characters, and special output formats. For example, you can use placeholders such as %s and %d to format strings and numbers, use \t to achieve tab alignment, and use ANSI escape sequences to set text color, etc.

In summary, the print function is a built-in function in Python for outputting content to the standard output device. It can be used to print text, variable values, the results of expressions, etc. By specifying parameters such as delimiter, terminator, output stream, and refresh method, you can flexibly control the format and behavior of printing. In actual development, the print function is a very useful tool and can be used in scenarios such as debugging, outputting results, and interactive operations.

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