python-回文字符串[通俗易懂]

import string
def huiwen(text):
    return text[::-1]
def isHuiWen(text):
    text = text.lower()
    text = text.replace(' ', '')
    for n in string.punctuation:
        text = text.replace(n, '')
    return text == huiwen(text)
def main():
    text = input("")
    if isHuiWen(text):
        print("True")
    else:
        print("False")
if __name__ == '__main__':
    main()

a=input()
b=''
for c in a:
    if c.isalpha() or c.isdigit():
        b=b+c.lower()
for i in range(len(b)//2):
    if b[i]!=b[-1-i]:
        print(False)
else:
    print(True)

a=input()
#只留下数字和字母，统一变为小写
b=''.join(map(lambda x:x.lower() if x.isdigit() or x.isalpha() else '',a))
#与倒转对比是否相等
print(b==b[::-1])