Python: finding an element in a list [duplicate]

The best way is probably to use the list method .index.

For the objects in the list, you can do something like:

def __eq__(self, other):
    return self.Value == other.Value

with any special processing you need.

You can also use a for/in statement with enumerate(arr)

Example of finding the index of an item that has value > 100.

for index, item in enumerate(arr):
    if item > 100:
        return index, item

Source

Related Posts:

  1. How can I reverse a list in Python?
  2. Difference between del, remove, and pop on lists
  3. How can I reverse a list in Python?
  4. What is the difference between Python’s list methods append and extend?
  5. Understanding slice notation
  6. Understanding slice notation
  7. How to convert list to string [duplicate]
  8. How do I get the number of elements in a list?
  9. Finding the index of an item in a list
  10. Accessing the index in ‘for’ loops?
  11. How to make a flat list out of a list of lists
  12. Removing duplicates in lists
  13. List changes unexpectedly after assignment. Why is this and how can I prevent it?
  14. TypeError: ‘float’ object is not subscriptable
  15. Is there a short contains function for lists?
  16. TypeError: ‘float’ object is not subscriptable
  17. Transpose/Unzip Function (inverse of zip)?
  18. appending list but error ‘NoneType’ object has no attribute ‘append’
  19. Check if something is (not) in a list in Python
  20. How to avoid “RuntimeError: dictionary changed size during iteration” error?
  21. Finding the average of a list
  22. Print a list in reverse order with range()?
  23. Fastest way to check if a value exists in a list
  24. How can I count the occurrences of a list item?
  25. TypeError: ‘list’ object cannot be interpreted as an integer
  26. Why is it string.join(list) instead of list.join(string)?
  27. Why is it string.join(list) instead of list.join(string)?
  28. How do I concatenate two lists in Python?
  29. Finding median of list in Python
  30. Python set to list
  31. Python List vs. Array – when to use?
  32. Get list from pandas dataframe column or row?
  33. Finding and replacing elements in a list
  34. ValueError: max() arg is an empty sequence
  35. Remove list from list in Python
  36. Append integer to beginning of list in Python
  37. List comprehension on a nested list?
  38. Union of two lists in Python
  39. Python: Array v. List
  40. Writing a list to a file with Python
  41. How do I check if a list is empty?
  42. Understanding slice notation
  43. Add list to set?
  44. What’s the idiomatic syntax for prepending to a short python list?
  45. How to remove an element from a list by index
  46. Apply function to each element of a list
  47. Converting Dictionary to List?
  48. How to deep copy a list?
  49. TypeError: list indices must be integers or slices, not str
  50. How to check if a string is a substring of items in a list of strings?
  51. In Python, when to use a Dictionary, List or Set?
  52. Check if two unordered lists are equal
  53. ‘list’ object has no attribute ‘shape’
  54. How do I find the duplicates in a list and create another list with them?
  55. How can I compare two lists in python and return matches
  56. How do I check if a list is empty?
  57. How can I get list of values from dict?
  58. IndexError: list index out of range and python
  59. AttributeError: ‘list’ object has no attribute ‘replace’ when trying to remove character
  60. How to sort a list of objects based on an attribute of the objects?
  61. Pop index out of range
  62. AttributeError: ‘list’ object has no attribute ‘replace’ when trying to remove character
  63. Print list without brackets in a single row
  64. How do you split a list into evenly sized chunks?
  65. How to iterate through two lists in parallel?
  66. How to remove \n from a list element?
  67. How do I check if there are duplicates in a flat list?
  68. How to return dictionary keys as a list in Python?
  69. Append a tuple to a list – what’s the difference between two ways?
  70. Defining lists as global variables in Python
  71. Subtracting two lists in Python
  72. How can I remove all instances of an element from a list in Python?
  73. Create an empty list in Python with certain size
  74. Get the cartesian product of a series of lists?
  75. How to concatenate items in a list to a single string?
  76. Python 2: AttributeError: ‘list’ object has no attribute ‘strip’
  77. What does the “x for x in” syntax mean?
  78. How to make a set of lists
  79. Python data structure sort list alphabetically
  80. TypeError: unsupported format string passed to list.__format__
  81. numpy-equivalent of list.pop?
  82. Create nice column output in python
  83. TypeError: only integer arrays with one element can be converted to an index 3
  84. How to create a numpy array of lists?
  85. Logical indexing with lists
  86. How does str(list) work?
  87. convert csv file to list of dictionaries
  88. Element-wise addition of 2 lists?
  89. How to split elements of a list?
  90. Find object in list that has attribute equal to some value (that meets any condition)
  91. Turn a single number into single digits Python
  92. Iterating through list of list in Python
  93. Python cant convert ‘list’ object to str error [closed]
  94. Get difference between two lists
  95. How is Python’s List Implemented?
  96. Determine if 2 lists have the same elements, regardless of order? [duplicate]
  97. Building a list inside a list in python
  98. Writing Python lists to columns in csv
  99. Sorting list based on values from another list
  100. Create a list with initial capacity in Python

Leave a Comment