1.if判断

# 变量
age = 18
# 输入密码
ing_put = input('>>>>>....')
# 字符转整数
ing_put = int(ing_put)
# if判断
if ing_put == age:
    print('输入成功')
else:
    print('输入失败')


# 多变量判断
age = 18
name = 'gefei'
is_start = True
if age >= 18 and age <= 25 and name == 'gefei' and is_start:
    print('开始表白。。。。')
else:
    print('表白失败。。。。')

if判断成绩
source = input('》》》》...')
source = int(source)
if source >= 80 and source <= 100:
    print('优秀')
elif source <= 80 and source >= 60:
    print('普通')
else:
    print('很差')

# if套用
age = 18
name = 'gefei'
is_start = True
is_start1 = 123
if age >= 18 and age <= 25 and name == 'gefei' and is_start:
    print('开始表白。。。。')
    if is_start1:
        print('一见钟情')
    else:
        print('逗你玩')
else:
    print('表白失败。。。。')

2.while 循环

# while条件循环
name_stg = 'mzk'
passwd_stg = '000'
tag = True
while tag:
    name_st = input('请输入你的账户名>>>')
    passwd_st = input('请输入你的你密码>>>')
    if name_st == name_stg and passwd_st == passwd_stg:
        print('输入正确。。。')
        tag = False
    else:
        print('输入不正确')


# while+break代表结束本层循环
name_stg = 'mzk'
passwd_stg = '000'
while True:
    name_st = input('请输入你的账户名>>>')
    passwd_st = input('请输入你的你密码>>>')
    if name_st == name_stg and passwd_st == passwd_stg:
        print('输入正确。。。')
        break
    else:
        print('输入不正确')

3.for 循环

#while循环 VS for循环
#1.
#while循环：称之为条件循环，循环的次数取决于条件何时为False
#for循环：称之为...循环，循环的次数取决于数据的包含的元素的个数

#2.
#for循环专门用来取值，在循环取值方面比while循环要强大，以后但凡
#遇到循环取值的场景，就应该用for循环

#  0   1    2
l=['a','b','c']
for i in range(3):
    print(i,l[i])

#for+break
names=['egon','kevin','alex','hulaoshi']
for name in names:
    if name == 'alex':break
    print(name)

#for+continue
names=['egon','kevin','alex','hulaoshi']
for name in names:
    if name == 'alex':continue
    print(name)

#for+else
names=['egon','kevin','alex','hulaoshi']
for name in names:
    # if name == 'alex':break
    print(name)
else:
    print('=====>')

for循环嵌套
for i in range(3): #i=2
    for j in range(2): #j=1
        print(i,j) #2，1