第四周作业

一只青蛙一次可以跳上1级台阶，也可以跳上2级。请问该青蛙跳上一个n级的台阶总共有多少种跳法。‪‬‪‬‪‬‪‬‪‬‮‬‪‬‮‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‭‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‭‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‭‬

输入台阶数，输出一共有多少种跳法

def jump(num):
    if num <= 2:
        return num
    else:
        t1,t2 = 1,2
        for i in range(3,num+1):
            t1,t2 = t2,t1+t2
        return t2
n = eval(input())
t = jump(n)
print(t)

验证码校验

a = input()
before = 'qS2x'
after = 'Qs2X'
table = ''.maketrans(before, after)
if a.translate(table) == 'Qs2X':
    print('验证码正确')
else:
    print('验证码错误，请重新输入')

大小写转换

str = input()
for c in str:
    if 'a' <= c <= 'z':
        c = c.upper()
        print(c,end='')
        continue
    elif 'A' <= c <= 'Z':
        c=c.lower()
        print(c,end = '')
    else:
        print(c,end = '')

查找特定字符

str = input()
for c in str:
    if 'a' <= c <= 'z':
        c = c.upper()
        print(c,end='')
        continue
    elif 'A' <= c <= 'Z':
        c=c.lower()
        print(c,end = '')
    else:
        print(c,end = '')

敏感词过滤

str = input()
print(str.replace('垃圾','*').replace('陷阱','*').replace('不要脸','*').replace('内幕','*').replace('辣鸡','*'))

字符串替换

old = input()
new = input()
alls = input()
print(alls.replace(old,new))

身份证号处理

from datetime import*
now = datetime.now().year
num = str(input())
print('你出生于{}年{}月{}日'.format(num[6:10],num[10:12],num[12:14]))
age = now - eval(num[6:10])
print('你今年{}周岁'.format(age))
if eval(num[16]) % 2 == 0:
    print('你的性别为女')
else:
    print('你的性别为男')