i want to remove the itemes that them value is lower than18 in this dict but ithas eror:dictionary changed size during iteration

Question

how can i fix it
a={"math":15,"geography":20,"history":13,"basketball":19}
for i in a:
if a[i]<18:
del a[i]
print(a)

Answer 1

Use iterable Dict as a copy like... a.copy().

Edit:

a={"math":15,"geography":20,"history":13,"basketball":19}
for i in a.copy():
if a[i]<18:
del a[i]
print(a)

Answer 2

Sounds like you could use the filter function.

a = dict(filter(lambda item: item[1] > 17, a.items()))

https://docs.python.org/3/library/functions.html#filter

https://thispointer.com/python-filter-a-dictionary-by-conditions-on-keys-or-values/

Answer 3

Maybe this works

https://code.sololearn.com/c551r0jOW0c6/?ref=app

Answer 4

Jayakrishna🇮🇳 thanks ,but my question wants me to delet some items from the first dict..what can i do?

Answer 5

mahsa it deletes from original dictionary only...
According to your code, Just before start of loop, it will have a copy as iterable, which is not changing in loop, but you deleting from original...

Answer 6

Jayakrishna🇮🇳 thank a lot

Answer 7

mahsa you're welcome..