Python · Theory

isdecimal()

Theory

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isdecimal()

isdecimal is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

isdecimal() — output — True then False. Decimal digits only.

Fresher trap: writing s.isdecimal() and expecting s to update. Strings are immutable. Write s = s.isdecimal(...) if you need the new value (when it returns a string).

Exam tip

Call isdecimal on one real word and say what prints.

Example

# isdecimal()
print("21".isdecimal())
print("²".isdecimal())

isdecimal() — output: True then False. Decimal digits only.

Short notes

Defisdecimal works on str.
Ruleisdecimal usually returns a new string.
Trapisdecimal does not change the original string in place.

Python · Theory

isdecimal()

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Theory

220/268

isdecimal()

isdecimal is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

isdecimal() — output — True then False. Decimal digits only.

Fresher trap: writing s.isdecimal() and expecting s to update. Strings are immutable. Write s = s.isdecimal(...) if you need the new value (when it returns a string).

Exam tip

Call isdecimal on one real word and say what prints.

Example

# isdecimal()
print("21".isdecimal())
print("²".isdecimal())

isdecimal() — output: True then False. Decimal digits only.

Short notes

Defisdecimal works on str.
Ruleisdecimal usually returns a new string.
Trapisdecimal does not change the original string in place.

isdecimal()

Example

Short notes

Questions

isdecimal()

Example

Short notes

Questions