I. Python Basics

One. The origins of Python

 Python is an explanatory weak-type programming language. 
 Features: Simple. Clear. Elegant 
 
 Two. The Python interpreter 
 CPython. is provided by the official. Internal use of the C language to implement 
 PyPy. To interpret our code as a bytecode file at once. You can run it directly. 
 
 Three. The first Python program 
 Print (any content) 
 
 Four. Variable 
 The intermediate value produced during the run of the program. Temporarily saved in memory. For subsequent programs to use the 
 naming convention: 
 1. Use letters, numbers, underscores 
 2. Cannot start with a number, not a pure number 
 3. You cannot use the Python keyword 
 4. Don't be too long 
 5. 
 6. Case Sensitive 
 7. Do not use Chinese 
 8. It is recommended to use the hump or Underline 
 
 
 Five. The data type of the variable 
 1. int. Integer. You can do +,-, *,/,%,//
 2. str. String. can be + * 
 3. bool. A Boolean value. Two values. True, False 
 Six. User interaction 
 Variable = input (Prompt) 
 received is the string type 
 str = > int = int (str) 
 Seven. Process Control (IF) 
 If condition: 
 code block 
 
 If condition 1: 
 code block 1 
 Else: 
 code block 2 
 
 If condition 1: br> code block 
 elif Condition 2: 
 code block 
 Elif .... 
 Else: 
 
 
 If condition: 
 If condition: 
 If condition: 
 code block 
 Else: 
 else: 

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I. Python Basics