#🔒 why does this work? it shouldn't 😔😭

21 messages · Page 1 of 1 (latest)

rare geyser
#

does anyone have more of these cursed python examples?

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pliant elmBOT
#

@rare geyser

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rare geyser
#

like... it actually works though and that even in 3.6

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🙏🙏

sterile vigil
#

that's not cursed

junior hare
#

functions that return functions are used in tons of places

rare geyser
#

what how would that be useful?

#

outer()(2) is the exact same as

def outer(x): return x**2
outer(2)```
just that one defines an unnecessary lambda and needs extra parenthesis
junior hare
#

You could do like a closure

#

or something

# 
def make_multiplier(multiplier):
    def multiplier_function(x):
        return x * multiplier
    return multiplier_function

double = make_multiplier(2)
triple = make_multiplier(3)

print(double(4))  # 8
print(triple(4))  # 12
#

like that

#

You could also do like a logger or something

sterile vigil
# rare geyser outer()(2) is the exact same as ```py def outer(x): return x**2 outer(2)``` just...

!e
Functions that capture variables from the outer scope ("closures") are very useful. For example:

my_students = [
    {"id": 2, "name": "charlie", "grade": 7},
    {"id": 10, "name": "alice", "grade": 5},
    {"id": 11, "name": "denise", "grade": 5},
    {"id": 5, "name": "bob", "grade": 2},
]

def sort_by_grade(students, field):
    if field not in {"name", "grade"}:
        raise KeyError("Can only sort by name and grade")
    return sorted(students, key=lambda s: (s[field], s["id"]))

print(sort_by_grade(my_students, "name"))
pliant elmBOT
sterile vigil
#

Returning a closure defined with def, on the other hand, is extremely common. That's how most decorators are implemented in libraries

rare geyser
pliant elmBOT
#
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