import base64

# str为待加密字符串
str='Y3liZXJwZWFjZXtXZWxjb21lX3RvX25ld19Xb3JsZCF9'
str=str.encode("utf-8")
str_encode=base64.b64encode(str)
print(str_encode)

import base64

# str为待加密字符串
str='Y3liZXJwZWFjZXtXZWxjb21lX3RvX25ld19Xb3JsZCF9'
str=str.encode("utf-8")
str_encode=base64.b64decode(str)
print(str_encode)

# 凯撒密码
# 常规 暴力破解
str=input('输入待破解字符串：')
for i in range(1,27):
  for j in str:
    if j.isalpha():
      if (ord(j)>=97 and ord(j)+i>97+25) or (ord(j)<97 and ord(j)>=65 and ord(j)+i>65+25): # 小写字母
          print(chr(ord(j)+i-26),end='')
      else:
          print(chr(ord(j)+i),end='')

    else:
      print(j,end='')

  print('\n')

str='11 111 010 000 0 1010 111 100 0 00 000 000 111 00 10 1 0 010 0 000 1 00 10 110'
str2=''

for i in str:
  if i=='1':
    str2+='-'
  elif i=='0':
    str2+='.'
  else:
    str2+=i
print(str2)