Variable Type Conversion: Methods to Convert int, str, and float in Python

Python variable type conversion is used to handle different data types and relies on three built-in functions: `int()`, `str()`, and `float()`. It is applicable to scenarios such as user input and numerical calculations. **Basic Type Review**: int (integer), str (pure character sequence), float (numbers with decimal points). **Conversion Rules**: - **int ↔ str**: `str()` can convert an int to a string (risk-free); `int()` requires the string to be a pure number (error occurs if it contains decimal points or letters). - **str ↔ float**: `float()` can convert a string with a decimal point to a float; `str()` can convert a float to a string. - **float ↔ int**: When converting a float to an integer using `int()`, the decimal part is truncated (not rounded). **Notes**: Converting non-numeric strings will throw a `ValueError`. Use `try-except` to catch errors when uncertainty exists. **Summary**: Mastering conversion rules (e.g., only pure numeric strings can be converted to int) and error handling can avoid type mismatch errors and improve data processing efficiency.