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决策语句 ​

Python中的条件语句涉及3个关键字：if、else和elif，这3个关键字对应条件语句的3种结构。

if 语句 ​

python
age = input("Enter your age: ")
if int(age) < 18:
    print('未成年人')
elif 18 <= int(age) < 60:
    print('中年人')
elif int(age) >= 60:
    print('老年人')

循环语句 ​

while 语句 ​

python
count = 0
while count < 3:
    count = count + 1
    print(count)

输出

python
1
2
3

for 语句 ​

python
for item in 'ChatGIS':
    print(item)

输出

python
C
h
a
t
G
I
S