程序流程控制

分支语句

• if
• if-else
• if-elif-else

if missYou:
    print("I miss you.")
else:
    print("I don't miss you.")

循环语句

• while

遇到break、return、异常，循环会终止。

while missYou:
    print("I miss you.")
    missYou=False
else:
    print("ELSE.")

• for

for item in items:
    print(item)
else:
    print("ELSE.")
for item in range(1,10):
    print(item) # 输出1-9

跳转语句

• break
• continue
• return