What is Python ord()? What is the use of ord()?

This chapter introduces the meaning and function of the ord() function in Python. Generally speaking, the ord() function is mainly used to return the ascii code of the corresponding character, chr( ) is mainly used to represent the characters corresponding to the ASCII code. When input, the numbers can be decimal or hexadecimal. That is to say, the ord() function is the paired function of the chr() function (for 8-bit ASCII strings) or the unichr() function (for Unicode objects). It takes one character (a string of length 1) as a parameter, Returns the corresponding ASCII value, or Unicode value. If the given Unicode character exceeds your Python definition range, a TypeError exception will be raised.

1 >>> ord("a")
2 97
3 >>> chr(97)
4 'a'

For example, to generate an alphabet list, we can do this:

>>> [chr(i) for i in range(97,123)]
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 
'm', 'n', 'o', 'p','q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

# 用户输入字符
c = input("请输入一个字符: ")
 
# 用户输入ASCII码，并将输入的数字转为整型
a = int(input("请输入一个ASCII码: "))

print( c + " 的ASCII 码为", ord(c))
print( a , " 对应的字符为", chr(a))

1 请输入一个字符: a
2 请输入一个ASCII码: 101
3 a 的ASCII 码为 97
4 101  对应的字符为 e

or this:

>>> chr(65)
'A'
>>> ord('a')
97
>>> unichr(12345)
u'\u3039'
>>> chr(12345)
Traceback (most recent call last):
   File "<stdin>", line 1, in ?    
     chr(12345)
ValueError: chr() arg not in range(256)
>>> ord(u&#39;\ufffff&#39;)
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
     ord(u&#39;\ufffff&#39;)
TypeError: ord() expected a character, but string of length 2 found
>>> ord(u&#39;\u2345&#39;)
9029

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