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Python 3 List Type errors All In One

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Python 3 List Type errors All In One

Python 3.9.x+

error

NameError: name 'List' is not defined

image

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):
        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

  1. from typing import List
def twoSum(self, nums: List[int], target: int) -> List[int]:
  1. python 3.9.x+ built-in collection types list
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


# from ast import List
# ❌ TypeError: 'type' object is not subscriptable

# ✅ List types
from typing import List

class Solution:
  # ❌ NameError: name 'List' is not defined
  def twoSum(self, nums: List[int], target: int) -> List[int]:
  # ✅ ✅ build-in collection types, list
  # def twoSum(self, nums: list[int], target: int) -> list[int]:
    print("\nnums =", nums)
    print("target =", target)
    arr = []
    for i, n in enumerate(nums):
      v = target - n
      # ❌ AttributeError: 'list' object has no attribute 'slice'
      # for j, m in enumerate(nums.slice(i)):
      # for j, m in enumerate(nums[i:]):
      for j, m in enumerate(nums):
        if(i != j and v == m):
          arr.append(i)
          arr.append(j)
          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():
  # instance 实例化 ✅, fix: TypeError: twoSum() missing 1 required positional argument: 'target'
  # https://stackoverflow.com/questions/17534345/why-do-i-get-typeerror-missing-1-required-positional-argument-self-trying
  solution = Solution()
  for index, test in enumerate(tests):
    [arr, target] = test
    # print("\narr, target = ", arr, target)
    value = solution.twoSum(arr, target)
    result = results[index]
    # print("❓value =", value)
    # print("result ", result)
    if(str(value) == str(result)):
      print("✅ passed", index)
    else:
      print("❌ failed", arr, result)

test()

""" 
# https://leetcode.com/problems/two-sum/
$ py3 ./0001_two-sum.py

"""

https://leetcode.com/problems/two-sum/

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