Analysis of if conditional judgment code in python

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Execution process of conditional statement:

if condition Judgment Note:
1. Use a colon after each condition : to indicate the code to be executed when the condition is True;
2. Use indentation to divide code blocks. Statements with the same indentation number form a code block together.

if...else, single condition judgment

username_store = 'lipandeng'
password_store = '123'

username_input = input('your username:')
password_input = input('your password:')

if username_input == username_store and password_input == password_input:
    print('welcome {0}'.format(username_input))
else:
    print('Invalid username and password!')

if...elif.. .else, multi-condition judgment

score = int(input('Enter your score:'))     # input()返回的数据类型是str，int()函数是把str转int。

if score < 0 or score > 100:    # 条件1，此条件为True时执行print()，elif后面的代码不再执行。
    print(&#39;Scores of the range is 0-100.&#39;)
elif score >= 90:   # 条件2，当条件1为False时判断条件2，此条件为True时执行print()，elif后面的代码不再执行。
    print(&#39;Your score is excellent.&#39;)
elif score >= 60:   # 条件3，当条件1和条件2为False时判断条件3，此条件为True时后执行print()，elif后面的代码不再执行。
    print(&#39;Your score is good.&#39;)
else:   # 条件4，以上判断条件都为False时执行的print()。
    print(&#39;Your score is not pass the exam.&#39;)

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