判斷
if <條件判斷1>:
<執(zhí)行1>
elif <條件判斷2>:
<執(zhí)行2>
elif <條件判斷3>:
<執(zhí)行3>
else:
<執(zhí)行4>

循環(huán)

for in 循環(huán)

names = ['Michael', 'Bob', 'Tracy']
for name in names:
print(name)

while 循環(huán)

sum = 0
n = 99
while n > 0:
sum = sum + n
n = n - 2
print(sum)