Str vs bytes in python
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in python, there are two main types for handling textual data: `str` and `bytes`. understanding the difference between these two types is crucial for effectively working with text and binary data, especially when dealing with file i/o, network communications, or any operations that involve encoding and decoding.
overview
1. **`str`**:
represents a sequence of unicode characters.
used for textual data.
supports various string manipulations and methods.
default encoding in python 3 is utf-8.
2. **`bytes`**:
represents a sequence of bytes (8-bit values).
used for binary data.
cannot be manipulated like a string (e.g., you cannot use string methods directly on bytes).
created using a byte literal, e.g., `b'...'`.
key differences
**encoding**: `str` is text, while `bytes` is raw binary data. `str` can be encoded to `bytes` and vice versa using specific character encodings (most commonly utf-8).
**mutability**: both `str` and `bytes` are immutable in python.
**size**: a `str` can take more memory than `bytes` for the same content, especially when using multi-byte characters in unicode.
converting between `str` and `bytes`
you can convert between `str` and `bytes` using the `encode()` and `decode()` methods.
**convert `str` to `bytes`**: use the `encode()` method.
**convert `bytes` to `str`**: use the `decode()` method.
example code
here’s a simple example to illustrate the differences and conversions between `str` and `bytes`:
output explanation
1. the original string is displayed, and its type is confirmed to be `str`.
2. the string is encoded into a byte sequence using utf-8, and the result is shown as `bytes`.
3. the byte sequence is decoded back into a string, confirming that the conversion works correctly.
4. a non-ascii string ("café") is handled similarly, demonstrating that utf-8 can correctly encode and decode characters beyond the standard ascii range.
5. finally, a byte literal ...
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