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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsUse str.encode() to turn Python text into bytes. For a mutable byte array, wrap the result in bytearray:
text = "café"
data = text.encode("utf-8") # bytes
mutable_data = bytearray(data) # bytearray
values = list(data) # list of integersChoose the output type your code needs, and specify the text encoding—usually UTF-8—so the bytes can be interpreted correctly.
Choose the result type you need
Python str objects hold text; bytes and bytearray hold encoded binary data. Encoding is the step that represents text as bytes. Python’s built-in type documentation describes these types and str.encode().
| Result | How to create it | What it is for |
|---|---|---|
bytes |
text.encode("utf-8") |
Immutable binary data; the usual choice for files, network protocols, and APIs that accept bytes. |
bytearray |
bytearray(text.encode("utf-8")) |
Mutable binary data when bytes need to be changed in place. |
list of integers |
list(text.encode("utf-8")) |
One integer from 0 through 255 for each encoded byte; use when an interface specifically expects integer values. |
In Python, “byte array” can mean a mutable bytearray, but some callers use it loosely to mean bytes in general. Check what the receiving function requires: bytes, bytearray, and a list of integers are different types.
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Encode a string as bytes
Call encode() on the string. UTF-8 is Python’s default encoding for this method, but stating it explicitly makes the intended representation clear:
text = "Hello, 世界"
encoded = text.encode("utf-8")
print(type(encoded)) # <class 'bytes'>UTF-8 can represent every Unicode code point. ASCII characters use one byte, while many other characters use more. As a result, the number of encoded bytes may differ from the number of characters in the string. See the Python Unicode HOWTO for an explanation of Unicode and UTF-8.
Make the bytes mutable or inspect their values
Convert to a mutable bytearray
Pass the encoded bytes to bytearray() when you need to edit the binary data:
text = "Hello, 世界"
mutable = bytearray(text.encode("utf-8"))
mutable[0] = ord("h")The original string is unchanged; the assignment changes the first byte in the mutable array.
Get one integer per byte
Use list() if an API or debugging task needs integer byte values:
encoded = "Aé".encode("utf-8")
values = list(encoded)
print(values) # [65, 195, 169]The two displayed characters produce three UTF-8 bytes, so the list has three values. A list is not itself a byte buffer and is usually unnecessary when the consumer accepts bytes or bytearray.
Choose an encoding that matches the receiver
Use UTF-8 for general text interchange unless a file format, API, or legacy protocol requires another encoding. If a specification requires a legacy encoding, name it rather than relying on an environment-dependent assumption. For example, Latin-1 maps code points U+0000 through U+00FF; a character outside that range cannot be encoded with it under strict handling. Python’s codecs documentation describes encodings and UTF-8 variants.
text = "café"
encoded = text.encode("latin-1")The default error policy is strict: if the selected encoding cannot represent a character, Python raises UnicodeEncodeError. You can request errors="ignore" or errors="replace", but these policies drop or substitute unrepresentable text. Use them only when that change is acceptable for the data.
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To recover text, decode the bytes using the same encoding used to create them:
text = "Hello, 世界"
encoded = text.encode("utf-8")
restored = encoded.decode("utf-8")str(encoded) is not a substitute for decoding. It gives a representation of the bytes object rather than interpreting those bytes as text.
UTF-8 and Base64 are different operations
UTF-8 encodes Unicode text as bytes. Base64 takes existing binary data and represents it using printable ASCII characters. Base64 does not choose how text should be encoded; if you need Base64 text, first encode the string with the character encoding required by your format, then apply Base64 to those bytes.
Use a UTF-8 BOM only when required
Ordinary UTF-8 does not require a byte-order mark (BOM). Python’s utf-8-sig variant writes a BOM when encoding and skips it at the start when decoding. Use that variant only when the receiving file format or application expects the signature.
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