{"id":594,"date":"2024-10-19T07:23:23","date_gmt":"2024-10-19T07:23:23","guid":{"rendered":"https:\/\/itsmycode.com\/?p=594"},"modified":"2024-10-19T07:23:24","modified_gmt":"2024-10-19T07:23:24","slug":"python-callable","status":"publish","type":"post","link":"https:\/\/itsmycode.com\/python-callable\/","title":{"rendered":"Python callable()"},"content":{"rendered":"\n

The callable()<\/code><\/strong> function in Python returns True <\/code><\/strong>if the object passed appears to be callable. Otherwise, it returns False<\/code><\/strong>.<\/p>\n\n\n\n

callable() Syntax <\/h2>\n\n\n\n

The syntax of the callable()<\/code><\/strong> method is <\/p>\n\n\n\n

callable(object)<\/strong><\/pre>\n\n\n\n
callable() Parameters<\/h2>\n\n\n\n
The callable()<\/code><\/strong> method can take only one argument, i.e., an object.<\/p>\n\n\n\n
callable() Return Value<\/h2>\n\n\n\n
The callable()<\/code><\/strong> function returns<\/p>\n\n\n\n
    \n
  • True <\/code><\/strong>\u2013 if the object appears callable<\/li>\n\n\n\n
  • False <\/code><\/strong>\u2013 if the object is not callable.<\/li>\n<\/ul>\n\n\n\n
    Note:<\/strong> There may be few cases where callable()<\/code><\/strong> returns True<\/strong>, but the call to the object may fail. But in case if callable()<\/code><\/strong> returns False<\/strong>, the calling object will never succeed.<\/p>\n\n\n\n
    Example 1:<\/strong> How does callable() works?<\/h2>\n\n\n\n
    Here, the object number <\/code><\/strong>is not callable. And, the object getData <\/code><\/strong>appears to be callable (but may not be callable).<\/p>\n\n\n\n
    # returns false as the object of integer is not callable\nnumber = 10\nprint(callable(number))\n\ndef getData():\n  print(\"Hello World\")\n\n# returns true as the variable is callable\nobj = getData\nprint(callable(obj))<\/code><\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    False\nTrue<\/code><\/pre>\n\n\n\n
    Example 2: When an Object is callable <\/h2>\n\n\n\n
    The built-in callable()<\/code><\/strong> method checks if the argument passed is either of the below two cases:<\/p>\n\n\n\n
      \n
    • An instance of a class having a\u00a0__call__<\/strong><\/code><\/em>\u00a0method.<\/li>\n\n\n\n
    • It is of a type that indicates callability, such as in functions, methods, etc. or has a non-null tp_call <\/code><\/em>(c struct) member.<\/li>\n<\/ul>\n\n\n\n
      # Python program to demonstrate callable()\nclass Test:\n  def __call__(self):\n    print('Hello World !!!')\n\n# Suggests that Test class is callable and returns True\nprint(callable(Test))\n\n# This proves that class is callable\nTestObject = Test()\nTestObject()<\/code><\/pre>\n\n\n\n
      Output<\/strong><\/p>\n\n\n\n
      True\nHello World !!!<\/code><\/pre>\n\n\n\n
      Example 3: When an Object is NOT callable <\/h2>\n\n\n\n
      The callable()<\/code><\/strong> method returns True<\/strong>, suggesting that the Test<\/strong> class is callable, but the instance of Test <\/strong>is not callable, and it returns a TypeError: \u2018Test\u2019 object is not callable<\/strong><\/p>\n\n\n\n
      # Python program to demonstrate NOT callable()\nclass Test:\n  def printdata(self):\n    print('Hello World !!!')\n\n# Suggests that Test class is callable and returns True\nprint(callable(Test))\n\n# The object will be created but returns error while calling\nTestObject = Test()\nTestObject()<\/code><\/pre>\n\n\n\n
      Output<\/strong><\/p>\n\n\n\n
      True\n\nTraceback (most recent call last):\n  File \"c:\\Projects\\Tryouts\\main.py\", line 11, in <module>\n    TestObject()\nTypeError: 'Test' object is not callable<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
      The callable() function in Python returns True if the object passed appears to be callable. Otherwise, it returns False. callable() Syntax  The syntax of the callable() method is  callable(object) callable() Parameters The callable() method can take only one argument, i.e., an object. callable() Return Value The callable() function returns Note: There may be few cases where […]<\/p>\n","protected":false},"author":1,"featured_media":595,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,1],"tags":[],"class_list":["post-594","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-built-in-methods","category-python"],"_links":{"self":[{"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/posts\/594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/comments?post=594"}],"version-history":[{"count":1,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/posts\/594\/revisions"}],"predecessor-version":[{"id":596,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/posts\/594\/revisions\/596"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/media\/595"}],"wp:attachment":[{"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/media?parent=594"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/categories?post=594"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itsmycode.com\/wp-json\/wp\/v2\/tags?post=594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}