Implementation Method and Usage Explanation of lower Function in python

This site previously described the use of the upper function (upper function) that converts lowercase characters of strings to uppercase in python. There is a need to convert lowercase to uppercase, and there are also cases of converting uppercase to lowercase. This article mainly introduces the lower function which can convert string uppercase to lowercase letters in python.

1. lower ()

Converts all uppercase characters in a string to lowercase

2. Grammar

str.lower() -> str

3. Return value

Returns a string that converts all uppercase letters in the string to lowercase letters

4. Use examples

#!/usr/bin/python3
str = "ABCDEFG"
print( str.lower() )

Output

abcdefg

The above is the introduction of lower function in python. If you need to change the uppercase of a string to lowercase, you can use lower function

lower Function Example

# Realization lower
def my_lower(string):
  if not string:
    return None
  
  lst = list(string)
  for index,item in enumerate(lst):# List numbers and subscripts at the same time 
    ascii_index = ord(item)
    if 65 <= ascii_index <= 90:
      s = chr(ascii_index+32)
      lst[index] = s
  return ''.join(lst)

if __name__ == '__main__':
  print(my_lower("2345ZRdV"))