Python ord() Function
Python3 Built-in Functionsord()is a built-in function in Python used to obtain the Unicode code point of a character.
ord()It accepts a character (a string of length 1) and returns its corresponding Unicode code point (integer). It ischr()the inverse function of chr().
Word Definition： ordYesordinalAbbreviation of (ordinal).
Basic Syntax and Parameters
Syntax Format
ord(c)
Parameter Description
- Parameter c：
- Type: Character (a string of length 1)
- Description: The character whose Unicode code point is to be obtained.
Function Description
- Return Value: Returns an integer representing the Unicode code point of the character.
Examples
Example 1: Basic Usage
Example
# English letters
print(ord('A')) # Output: 65
print(ord('Z')) # Output: 90
print(ord('a')) # Output: 97
print(ord('z')) # Output: 122
# Numbers
print(ord('0')) # Output: 48
print(ord('9')) # Output: 57
# Common symbols
print(ord('!')) # Output: 33
print(ord('@')) # Output: 64
# Chinese characters
print(ord('middle')) # Output: 20013
print(ord('language')) # Output: 25991
print(ord('you')) # Output: 20320
# Space
print(ord(' ')) # Output: 32
print(ord('A')) # Output: 65
print(ord('Z')) # Output: 90
print(ord('a')) # Output: 97
print(ord('z')) # Output: 122
# Numbers
print(ord('0')) # Output: 48
print(ord('9')) # Output: 57
# Common symbols
print(ord('!')) # Output: 33
print(ord('@')) # Output: 64
# Chinese characters
print(ord('middle')) # Output: 20013
print(ord('language')) # Output: 25991
print(ord('you')) # Output: 20320
# Space
print(ord(' ')) # Output: 32
Expected output:
65 90 97 122 48 57 33 64 20013 25991 20320 32
Code analysis:
- Uppercase letters A-Z have Unicode code points 65-90.
- Lowercase letters a-z have Unicode code points 97-122.
- Chinese characters typically have Unicode code points greater than 19968 (0x4E00).
Example 2: Working with chr()
Example
# ord() is the inverse function of chr()
print(chr(ord('A'))) # Output: A
print(ord(chr(65))) # Output: 65
# Character offset calculation
char = 'A'
offset = 3
new_char = chr(ord(char) + offset)
print(new_char) # Output: D
# Caesar cipher example
def caesar_encode(text, shift):
result = ""
for c in text:
if c.isalpha():
base = ord('A') if c.isupper() else ord('a')
result += chr((ord(c) - base + shift) % 26 + base)
else:
result += c
return result
print(caesar_encode("ABC", 3)) # Output: DEF
print(caesar_encode("XYZ", 3)) # Output: ABC
print(chr(ord('A'))) # Output: A
print(ord(chr(65))) # Output: 65
# Character offset calculation
char = 'A'
offset = 3
new_char = chr(ord(char) + offset)
print(new_char) # Output: D
# Caesar cipher example
def caesar_encode(text, shift):
result = ""
for c in text:
if c.isalpha():
base = ord('A') if c.isupper() else ord('a')
result += chr((ord(c) - base + shift) % 26 + base)
else:
result += c
return result
print(caesar_encode("ABC", 3)) # Output: DEF
print(caesar_encode("XYZ", 3)) # Output: ABC
Expected output:
A 65 D DEF ABC
ord()andchr()Used together, they can be applied in scenarios such as character encoding conversion and cryptography.
Other Extensions