Detailed explanation of the difference between print in Python2 and Python3

In both Python2 and Python3, the print() method is provided to print information, but the print between the two versions is slightly different

Mainly reflected in The following aspects:

1. In python3, print is a built-in function with multiple parameters, while in python2, print is a syntax structure;

2.Python2 You can print without parentheses: print 'hello world', Python3 requires parentheses print("hello world")

3. In Python2, the string required for input must be Add quotation marks, in order to avoid some behaviors that occur when reading non-string types, you have to use raw_input() instead of input()

1. In python3, perhaps developers feel that print has both I was a little uncomfortable with the dual identities, so I only kept the identity of the function:

>>> print 'pythontab.com'
SyntaxError: Missing parentheses in call to 'print'

So you must use parentheses for print in python3, because it is a function.

2. The print function in python3 has multiple parameters. The function prototype is as follows:

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

As can be seen from the above method prototype,

1. print can support multiple Parameter, supports printing multiple strings at the same time (where... represents any multiple strings);

2. sep represents what character is used to connect multiple strings;

3 . end indicates what characters to add to the end of the string. By pointing this parameter, you can easily set the printing without line wrapping. The print statement under Python2. "That's it. But under Python 3.x, print() becomes a built-in function, and the old method of adding "," will not work.

>>> print("python", "tab", ".com", sep='')
pythontab.com

>>> print("python", "tab", ".com", sep='', end='') #就可以实现打印出来不换行
pythontab.com

3. The pitfalls of input in Python2

print ("what do you like")
a = input("Enter any content:")
print ("i like",a)

An error will be reported when entering a string of characters , but this problem is solved well in python3.

The above is the detailed content of Detailed explanation of the difference between print in Python2 and Python3. For more information, please follow other related articles on the PHP Chinese website!