s = "aksjdjjhfhdhjaGGGGkkk"

s1 = s.capitalize()

print(s1)

s = "aksjdjjhfhdhjaGGGGkkk"

s2 = s.upper()

print(s2)

s = "aksjdjjhfhdhjaGGGGkkk"

s3 = s.lower()

print(s3)

s_str = 'AAeu2'

you_input = input('请输入验证码')

if you_input.upper() == s_str.upper():

    print('输入成功')

else :

    print('输入有误，请重新输入')

s = "aksjdjjhfhdhjaGGGGkkk"

s3 = s.swapcase()

print(s3)

s = 'alex peter matin'

s4 = s.title()

print(s4)

s = 'alex peter matin'

s5 = s.center(30,'~')

print(s5)

s = 'akdjnsjjsfjjaajkjskajjfnjbfsjkajsncfb'

l = len(s)

print(l)

s = 'shshdhjakkah'

s7 = s.startswith('shsh')   #判断字符串是不是以'shsh'开头

print(s7)

s71 = s.startswith('d',4,7)    #判断字符串4-7位是不是以'd'开头

print(s71)

s = 'shsjdGLjjjk'

s8 = s.find('GL')

s81 = s.index('GL')

print(s8)

print(s81)

s = '   kkfjjhfh   '

s9 = s.strip()

print(s9)

username = input('请输入用户名：').strip()

if username == '小明':

    print('小明你好棒啊')

s = '%*kkfjjhfh*'

s91 = s.strip('%*')

print(s91)

s = 'sjjdhhfkaj'

s10 = s.count('h')

print(s10)

s = 'alex：peter：matin'

s11 = s.split(':')

print(s11)

s = '我叫{}，今年{}，爱好{}，再说一次我叫{}'.format('小明',17,'girl','小明')

print(s)

s = '我叫{0}，今年{1}，爱好{2}，再说一次我叫{0}'.format('小明',17,'girl')

print(s)

s = '我叫{name}，今年{age}，爱好{hobby}，再说一次我叫{name}'.format(hobby='girl',name='小明',age=17)

print(s)

name = input('请输入你的名字：')

s = '我叫{0}，今年{1}，爱好{2}，再说一次我叫{0}'.format(name,17,'girl')

print(s)

s = '世界经济的会回复还犯困经济'

s11 = s.replace('经济','收入')

print(s11)

s = '世界经济的会回复还犯困经济'

s12 = s.replace('经济','收入',1)

print(s12)

s = 'sjsjjsjh123'

print(s.isalnum())  #判断字符串是不是由字母跟数字组成

print(s.isdigit())  #判断字符串是不是由数字组成

print(s.isalpha())  #判断字符串是不是由字母组成

s = 'sjsjhdhfkj'

for i in s:

    print(i)