What functions does the int function have in Python?

The int function is used to convert other data types or strings into the integer type.

Use an integer as a parameter. The parameter can be of the following types:

1. Integer: directly return this integer.
2. Convert floating-point numbers to integers by discarding the decimal part.
3. String: Convert a string to an integer, returning the corresponding integer if the string is a valid integer form; otherwise, a ValueError error will be raised if the string cannot be converted to an integer.
4. Other types: If the argument is of a different data type, it will attempt to call the __int__ method of that data type to convert it to an integer. If the __int__ method does not exist, a TypeError error will be thrown.

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int(10)  # 返回整数10
int(3.14)  # 返回整数3
int("123")  # 返回整数123
int("a")  # 抛出ValueError错误
int(True)  # 返回整数1