两分支 If-Else 语句
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if username == 'admin' and password == '123456':
print('身份验证成功!')
else:
print('身份验证失败!')
多分支 If-Elseif-Else 语句
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x = float(input('x = '))
if x > 1:
y = 3 * x - 5
elif x >= -1:
y = x + 2
else:
y = 5 * x + 3
悬空Else分支
使用pass命令执行“不执行任何操作”
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x = float(input('x = '))
if x > 1:
print(x)
else
pass
Attention：尽量避免没有必要的嵌套，嵌套既影响可读性也增加bug出现概率
Attention: 同时注意，与Pascal不同，if和else语句末尾有冒号”:”
References
Author: Mike Lyou
Link: https://blog.mikelyou.com/2020/01/02/python-learning-03-branch-structure/
Liscense: Copyright Statement: This python learning series are posted only for personal studies and communication. The whole series are not allowed to be reproduced unles otherwise indicated. I do not own copyright of some of the content. If any post accidentally infringes your copyright, it will be removed shortly after being informed. View python-learning-readme for more information.
