Python 3 List Type errors All In One
Python 3.9.x+
error
NameError: name 'List' is not defined
class Solution:
# ❌ NameError: name 'List' is not defined
def twoSum(self, nums: List[int], target: int) -> List[int]:
arr = []
for i, n in enumerate(nums):
v = target - n
for j, m in enumerate(nums.slice(i)):
if(i != j and v == m):
arr.append(i)
arr.append(j)
break
return arr
# test cases
t1 = [[2,7,11,15], 9]
t2 = [[3,2,4], 6]
t3 = [[3,3], 6]
tests = [t1, t2, t3]
r1 = [0,1]
r2= [1,2]
r3 = [0,1]
results = [r1, r2, r3]
def test():
for index, test in enumerate(tests):
r = Solution.twoSum(test)
result = results[index]
if(str(r) == str(result)):
print("passed ✅", index)
else:
print("failed ❌", index, test)
"""
$ py3 ./0001_two-sum.py
"""
solutions
from typing import List
def twoSum(self, nums: List[int], target: int) -> List[int]:
- python 3.9.x+
built-incollection typeslist
def twoSum(self, nums: list[int], target: int) -> list[int]:
https://stackoverflow.com/questions/57505071/nameerror-name-list-is-not-defined
https://peps.python.org/pep-0585/
https://docs.python.org/3.9/whatsnew/3.9.html#type-hinting-generics-in-standard-collections
demos
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