Python练习-循环及切片-2018.11.27

#直接用while循环去除.ad
l=['xuyutao.ad','wangjun.ad','liuchao.ad','liuyan1.ad']
n=0
L=[]
while n < 4:
    A=l[n][:-3]
    L.insert(n,A)
    n=n+1
print(L)

#while+定义函数去除.ad
def xad(x):
    if x[-3:] in '.ad':
        a=x[:-3]
        return a
    else:
        return
L=['xuyutao.ad','liuchao6.ad','liuyan1.ad','wagnjun.ad']
l=[]
n=0
while n<4:
    l.insert(n,xad(L[n]))
    n=n+1
print(l)

# 直接用while列出1×1，2×2,3×3，...，10×10的值
x=0
n=0
l=[]
while x<=10:
    l.insert(n,x*x)
    x=x+1
    n=n+1
print(l)

#定义函数+while列出1×1，2×2,3×3，...，10×10的值
def squ(x):
    y=x*x
    return y
l=[]
n=0
while n < 10:
    l.insert(n,squ(n+1))
    n=n+1
print(l)

 

#去除字符首尾的空格
def trim(x):
    if x[:1] ==' ':
        return x[1:]
    elif x[-1:] ==' ':
        return x[:-1]
    else:
        return x
print(trim('xinghen '))
print(trim(' xinghen'))
print(trim('xinghen'))
注：Python表示“等于”要用==，表示空格要用' '

 

转载于:https://www.cnblogs.com/xinghen1216/p/10027859.html