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Strings · easy

18. String formatting and parsing

f-strings, .format(), split/join, and number bases.

1 min read3 questionsup to 50 XPtopic 18/50

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Beyond f-strings, `.format()` and `%`-formatting exist for legacy code, but f-strings are preferred for new code.

python
addr = "0x" + "ab" * 2
parts = "a,b,c".split(",")          # ["a", "b", "c"]
",".join(["a", "b", "c"])           # "a,b,c"
int("ff", 16)                        # 255, parse hex
hex(255)                             # "0xff"
f"{3.14159:.2f}"                     # "3.14"

`str.strip()`, `.lstrip()`, `.rstrip()` remove whitespace (or given characters) from ends, useful for cleaning user input before validation.

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  2. 2. Re-read the code snippets and say out loud what each line does.
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Check your understanding

  1. 1. What does `"a,b,c".split(",")` return?

  2. 2. What does `int("ff", 16)` return?

  3. 3. What does `f"{3.14159:.2f}"` produce?

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