轻松学习python part2-控制语句

直接上笔记
很基础

# 流程控制
# if
pwd = input('input the password')
if pwd == 'admin':
    print('login...')
elif pwd == 'admin1':
    print('login as admin1')
else :
    print('incorrect password')
# 条件表达式
food = input('What your love')
reply = 'good' if food == 'apple' else 'bad'
print(reply)

# for循环
for i in range(1,10):
    print(i)
# 倒着打印
for j in range(10,0,-1):
    print(j)
# or
for k in range(10):
    print(10-k)

# while循环
m=0
while(m<10):
    print(m)
    m+=1

# while 与 for
# 实践经验告诉我们，应该多用for循环。但是有一些循环用for循环写不出来
# 计算阶乘 for实现
n = int(input('输入任意数值 要求>=0'))
fact = 1
for i in range(1,n+1):
    fact = fact * i
print(fact)

# 计算阶乘 while实现
l = int(input('输入数值 >=0'))
fac = 1
j = 1
while j <= l:
    fac = fac * j
    j += 1
print(fac)

# 计算用户输入数值的总和
# for 实现
n = int(input('how many numbers?'))
if n > 0:
    total = 0
    for i in range(n):
        s = int(input('enter num...'))
        total += s
print("有{}个数字，总和是{}".format(n,total))

# while 实现
h = int(input('how many'))
if h > 0:
    totals = 0
    k = 0
    while k < h:
        totals += int(input('enter...'))
        k += 1
print("有{}个数字，总和是{}".format(h,totals))

# 如果不知道用户输入多少个数字，for循环就难以实现，只能用while
s = input('number or "done"')
total = 0
while s != 'done':
    total += int(s)
    s = input('number or "done"')
print(total)

# 嵌套循环
# 最参见的案例就是99乘法表
for i in range(1,10):
    for j in range(1,10):
        p=i*j
        if p<10:
            print(' ',end='')
        print('{}*{}={}'.format(i,j,p),' ',end='')
    print()