What is the difference between range and xrange functions in Python 2.X?

In Python 2.x:

  • range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements.
  • xrange is a sequence object that evaluates lazily.

In Python 3:

  • range does the equivalent of Python 2’s xrange. To get the list, you have to explicitly use list(range(...)).
  • xrange no longer exists.

Related Posts:

  1. what does +=, -=, *= and /= stand for in Python?
  2. NameError: global name ‘xrange’ is not defined in Python 3
  3. Name ‘xrange’ is not defined in Python 3 [duplicate]
  4. Traverse a list in reverse order in Python
  5. When to use “while” or “for” in Python
  6. python “TypeError: ‘numpy.float64’ object cannot be interpreted as an integer”
  7. Python – TypeError: ‘int’ object is not iterable
  8. Why there is no do while loop in python
  9. What is the difference between rw+ and r+
  10. Python – TypeError: ‘int’ object is not iterable
  11. Accessing the index in ‘for’ loops?
  12. Python division
  13. Accessing the index in ‘for’ loops?
  14. raw_input function in Python
  15. Safest way to convert float to integer in python?
  16. How to avoid “RuntimeError: dictionary changed size during iteration” error?
  17. How to avoid “RuntimeError: dictionary changed size during iteration” error?
  18. Print a list in reverse order with range()?
  19. write() versus writelines() and concatenated strings
  20. How to iterate over a JavaScript object?
  21. No module named MySQLdb
  22. No module named MySQLdb
  23. How do you use subprocess.check_output() in Python?
  24. How can I concatenate str and int objects?
  25. Pythonic way to combine FOR loop and IF statement
  26. Subplot for seaborn boxplot
  27. How do you use subprocess.check_output() in Python?
  28. What does `<>` mean in Python?
  29. Exit while loop in Python
  30. While Loop in Mips (New to Mips)
  31. Pythonic way to iterate through a range starting at 1
  32. Pop index out of range
  33. While, Do While, For loops in Assembly Language (emu8086)
  34. Angular 2 Cannot find control with unspecified name attribute on formArrays
  35. Loop backwards using indices in Python?
  36. Why does using from __future__ import print_function breaks Python2-style print?
  37. Guess a number program with Java
  38. Python – ‘ascii’ codec can’t decode byte
  39. How to return dictionary keys as a list in Python?
  40. UnicodeEncodeError: ‘ascii’ codec can’t encode character u’\xa0′ in position 20: ordinal not in range(128)
  41. Breaking out of nested loops
  42. Is there a “do … until” in Python?
  43. Iterating over a 2 dimensional python list [duplicate]
  44. Infinite for loops possible in Python?
  45. Using multiple variables in a for loop in Python
  46. python: restarting a loop
  47. Python, Matplotlib, subplot: How to set the axis range?
  48. range() for floats
  49. What is the best way of determining a loop invariant?
  50. Why does Lua have no “continue” statement?
  51. built-in range or numpy.arange: which is more efficient?
  52. TypeError: super() takes at least 1 argument (0 given) error is specific to any python version?
  53. How do you write code to do factorials in MIPS?
  54. Python loop counter in a for loop
  55. Get a Try statement to loop around until correct value obtained
  56. What exactly do “u” and “r” string flags do, and what are raw string literals?
  57. Determine if 2 lists have the same elements, regardless of order? [duplicate]
  58. Printing from a declared array in MIPS
  59. Using print() (the function version) in Python2.x
  60. Python: Continuing to next iteration in outer loop
  61. How to read a CSV file from a URL with Python?
  62. How to import a csv-file into a data array?
  63. Python SyntaxError :’return’ outside function
  64. Datetime strptime in python
  65. Python error “ImportError: No module named”
  66. How do I append one string to another in Python?
  67. What do these operators mean (** , ^ , %, //)? [closed]
  68. Is there a simple, elegant way to define singletons? [duplicate]
  69. How can I use the apply() function for a single column?
  70. positional argument follows keyword argument
  71. Convenient way to deal with ValueError: cannot reindex from a duplicate axis
  72. TypeError: ‘str’ object cannot be interpreted as an integer [duplicate]
  73. Updating matplotlib in virtualenv with pip
  74. Is the standard Python implementation considered as a programming language or a scripting language?
  75. Python – from . import
  76. SystemError: Parent module ” not loaded, cannot perform relative import
  77. How to remove anaconda from windows completely?
  78. SyntaxError: non-default argument follows default argument
  79. Python Package bt: Bool index error
  80. Python list sort in descending order
  81. How to do while loops with multiple conditions
  82. TypeError: ‘<=' not supported between instances of 'str' and 'int' [duplicate]
  83. enumerate() for dictionary in python
  84. How to convert a PIL Image into a numpy array?
  85. How to get autocomplete in jupyter notebook without using tab?
  86. Print list without brackets in a single row
  87. Get first row value of a given column
  88. AttributeError: ‘module’ object has no attribute
  89. In Python How can I declare a Dynamic Array
  90. Python module for converting PDF to text
  91. from sys import argv – what is the function of “script”
  92. Using sudo with Python script
  93. What does the Ellipsis object do?
  94. How to concatenate items in a list to a single string?
  95. python pip on Windows – command ‘cl.exe’ failed
  96. pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available
  97. Rename specific column(s) in pandas
  98. How to create a numpy array of lists?
  99. Counting array elements in Python
  100. What is the maximum float in Python?

Leave a Comment