Python Basics: Basics

1. The first sentence of Python

Print ('helloWorld')

The file suffix name of the-python call can be any

-When importing a module, if it is not a. py file, an error will be

-It is recommended to always write the filename suffix as. py

2. Two modes of execution

1) Python interpreter py file path

2) Enter python into the interpreter for real-time input and get to the execution result (Interactive page)

3. Interpreter Path

# !/usr/bin/env python

4. Encoding

# -*-Coding:utf8-*-  

Eg: in a Linux environment,

Filename:

./2.py

Inside the file:

# !/usr/bin/env python
#-*-Coding:utf8-*-      % in Python3 this sentence does not need
Print ('helloWorld')

5. Perform an action

Prompt the user to enter a user name and password, if the user name and password are root, the login succeeds

#n is a variable, a variable can only consist of letters, numbers, underscores, cannot start with a number, cannot be named with a python keyword, and cannot be named with Python's built-in functions or classes#Using "" "" "in Python to annotate a programN1 = input ('Please enter user name:') N2= Input ('Please enter the password: ')ifN1 = ='Root'  andN2 = ='Root':Print('Login successful ')Else:Print('Logon Failure') "" "Print(N1)Print(n2) "" "

Python Basics: Basics