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Editorial Team
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Asked: 2026-05-28T02:24:23+00:00

class test: def __init__(self, val): self.val = val self.val.lower() Why doesn’t lower() operate on

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class test:
    def __init__(self, val):
        self.val = val
        self.val.lower()

Why doesn’t lower() operate on the contents of val in this code?

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1 Answer

  1. Editorial Team

    You probably mean:

    self.val = self.val.lower()

    Or, more concisely:

    class test:
    def __init__(self, val):
        self.val = val.lower()

    To elaborate, lower() doesn’t modify the string in place (it can’t, since strings are immutable). Instead, it returns a copy of the string, appropriately modified.

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