python-day1.7

　if...elsel逻辑判断

# Author:Reboot
name1 = "abc"
passwd1 = "123"
name2 = input("name:")
passwd2 = input("passwd:")
if name2 == name1 and passwd2 == passwd1:
    print("welcome user {name} login...".format(name=name2))
else:
    print("sad!")

if...elif..else猜大小

# Author:Reboot
age = 40
guess = int(input("guess:"))
if guess > age:
    print("big")
elif guess < age:
    print("small")
else:
    print("good")

while循环break

# Author:Reboot
a = 1
while True:
    print("a:", a)
    a = a + 1
    if a == 300:
        break

for循环

# Author:Reboot
for i in range(10):
    print("loop", i)

# Author:Reboot
for a in range(10):
    print('------', a)
    for b in range(10):
        print(b)
        if b > 5:
            break

自定义实现guess游戏

# Author:Reboot
age = 40
a =0
while a < 3 :
    guess = int(input("guess:"))
    if guess > age:
        print("big")
    elif guess < age:
        print("small")
    else:
        print("yes")
        break
    a = a + 1
    if a == 3:
        b = input("go on?")
        if b != "n":
            a =0

continue：跳出本次循环，进入下一次循环；；一个删除的效果，是为了满足循环条件下某些不需要的成分

# Author:Reboot
for letter in 'Python':  # 第一个实例
    if letter == 'h':
        continue
    print('当前字母 :', letter)

var = 10  # 第二个实例
while var > 0:
    var = var - 1
    if var == 5:
        continue
    print ('当前变量值 :', var)
print ("Good bye!")

循环套循环

# Author:Reboot
for a in range(10):
    print('------', a)
    for b in range(10):
        print(b)
        if b > 5:
            break