The difference between Python2 and python3 (continuous update)

1,print (print)

Python2 version:

print ' A ' outputs a string

Print a outputs a variable

Python3 version:

Print (' a ') outputs a string

Print (a) output a variable

2, input Python3 cancels the input mode of raw_input, and uses input to receive input.

Python2 version:

Raw_input is in the Python2 version, and all input from the user is treated as a string.

Input can only receive integer types.

Python3 version:

No raw_input function, using the input function to receive processing.

What the user is typing is what. For example, you enter a string:

n = input (' Please input somthing: ')

The user input string, ' ABCDEFG ', needs to be quoted in order to represent the string, otherwise the Python interpreter will consider it to be a variable.

User Input Number: 123

User input variable: a

3, list sort by using sort

The list in Python2 can be both a string and a number, then sort using sort, using Ascall code when sorting.

List1 = [' A ', ' B ', 123]
List1.sort ()
Print List1

Run Result: [123, ' A ', ' B ']

The list in Python3 must be a pure number to sort.

List1 = [' A ', ' B ', 123]
List1.sort ()



Operation Result:

Traceback (most recent):
File "c:/users/administrator/pycharmprojects/20180119/index.py", line A, in <module>
List1.sort ()
TypeError: ' < ' not supported between instances of ' int ' and ' str '

Continuous UPDATE!!!

The difference between Python2 and python3 (continuous update)