Python chr() built-in function
From the Python 3 documentation
Return the string representing a character whose Unicode code point is the integer i. For example, chr(97) returns the string 'a', while chr(8364) returns the string '€'. This is the inverse of ord().
Examples
>>> chr(1)
# '\x01'
>>> chr(10)
# '\n'
>>> chr(100)
# 'd'
>>> chr(1000)
# 'Ϩ'
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