Python -- variable | basic data type | if, while statement, pythonwhile

Python -- variable | basic data type | if, while statement, pythonwhile
Variable name: it can only contain numbers, letters, and underscores and cannot start with a number. Variable names cannot be basic data types of keywords in python: number, String, Boolean value (True/False)[If Condition Statement]

• If condition:

Code block else: code block

• If condition 1:

Code block elif condition 2: code block elif Condition 3: code block else: code block

• [Simple user logon program]

name = input("Username:")pwd = input("Password:")if name == "zjw" and pwd == "123"    print('yes')else:    print('no')

 

[While loop statement]

• While condition:

Code block [Instance]

• Returns all positive integers less than 10]

import time n = 1flag = Truewhile flag:     print(n)     if n ==10:          flag == False     n=n+1     time.sleep(1)print("end")

 

[Break] jumps out of the current loop, and the code below break is no longer executed. 

n =  1while True:     print(n)     if n ==10:          breakn=n+1

 

[Continue] jumps out of this loop and continues the next loop. 

while True:     print("123")     continue     print("456")