{"id":79309,"date":"2020-07-04T09:00:49","date_gmt":"2020-07-04T03:30:49","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=79309"},"modified":"2020-07-04T09:00:49","modified_gmt":"2020-07-04T03:30:49","slug":"ternary-operator-in-python","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/ternary-operator-in-python\/","title":{"rendered":"Ternary Operator in Python with Examples"},"content":{"rendered":"

Python\u2019s if-else<\/strong> statements are very easy to write and read. But they come with a downside. That is, if you want to print something based on some condition, you need 4 lines to do that.<\/p>\n

x = 10\nif x > 5:\n    print(\"greater\")\nelse:\n    print(\"smaller\")\n<\/pre>\n
That\u2019s an awful lot of lines for such a simple operation. What\u2019s the solution, you ask? Ternary operators<\/strong> in Python!<\/p>\n
Let’s learn more about Python ternary operators.<\/p>\n
What is Ternary Operator in Python?<\/h3>\n
The ternary operator in Python is nothing but a one-line version of the if-else statement. It provides a way to write conditional statements<\/strong> in a single line<\/strong>, replacing the multi-line if-else syntax<\/strong>.<\/p>\n
Syntax of Python ternary operator<\/strong><\/p>\n
<true_value> if <conditional_expression> else <false_value><\/pre>\n
Python ternary operator works with three operands:<\/p>\n
1. conditional_expression:<\/strong> This is a boolean condition that evaluates to either true or false.
\n2. true_value:<\/strong> The value returned by the ternary operator if the conditional_expression evaluates to True.
\n3. false_value:<\/strong> The value returned by the ternary operator if the conditional_expression evaluates to False.<\/p>\n
Example 1: Conditional expression is a boolean value<\/strong><\/p>\n
>>> nice_weather = True\n>>> print(\"Go out for a walk\" if nice_weather else \"watch a movie at home\")\n<\/pre>\n
Output:<\/strong><\/p>\n
Go out for a walk<\/div>\n
>>> nice_weather = False\n>>> print(\"Go out for a walk\" if nice_weather else \"watch a movie at home\")\n<\/pre>\n
Output:<\/strong><\/p>\n
watch a movie at home<\/div>\n
Example 2: Conditional expression is a boolean expression<\/strong><\/p>\n
>>> num = 12\n>>> print(\"Even\" if num % 2 == 0 else \"Odd\")<\/pre>\n
Output:<\/strong><\/p>\n
Even<\/div>\n
Example 3: Variable assignment<\/strong><\/p>\n
>>> a = 10\n>>> b = 5\n>>> largest = a if a > b else b\n>>> print(largest)\n<\/pre>\n
Output:<\/strong><\/p>\n
10
\n>>><\/div>\n
The variable largest gets the value of:<\/p>\n
    \n
  • a,<\/strong> if a is greater than b<\/li>\n
  • b,<\/strong> if a is not greater than b<\/li>\n<\/ul>\n
    The ternary operator using Tuple<\/h3>\n
    Another way to implement ternary operation in Python is by using a tuple<\/strong>. This is a simple replacement for the if-else ternary operator.<\/p>\n
    Syntax<\/strong><\/p>\n
    (false_value, true_value)[conditional_expression]<\/pre>\n
    In this case, the false_value<\/strong> and true_value<\/strong> form the two elements of the tuple. And the conditional_expression<\/strong> goes within the square bracket notation in place of an index<\/strong>. This works simply because the value of True is 1 and that of False is 0.<\/p>\n
    Therefore:<\/p>\n
      \n
    • If the conditional_expression evaluates to True, it\u2019s value becomes .<\/li>\n
    • Then the element at index 1 gets returned by the ternary expression.<\/li>\n
    • And if the conditional_expression evaluates to False, it\u2019s value becomes 0.<\/li>\n
    • Then the element at index 0 gets returned.<\/li>\n<\/ul>\n
      Be sure to put the false_value<\/strong> at index 0 and true_value<\/strong> at index 1 in the tuple.<\/p>\n
      >>> a = 10\n>>> b = 5\n>>> largest = (b, a)[a > b]\n>>> print(largest)\n<\/pre>\n
      Output:<\/strong><\/p>\n
      10<\/div>\n
      >>> nice_weather = True\n>>> print((\"Watch a movie at home\", \"Go out for a walk\")[nice_weather])\n<\/pre>\n
      Output:<\/strong><\/p>\n
      Go out for a walk
      \n>>><\/div>\n
      We can extend this syntax and use a list<\/strong> or a dictionary<\/strong> instead of a tuple.<\/p>\n
      The syntax for ternary operation using a list<\/h3>\n
      [false_value, true_value][conditional_expression]<\/pre>\n
      Example:<\/strong><\/p>\n
      >>> a = 10\n>>> b = 5\n>>> largest = [b, a][a > b]\n>>> print(largest)\n<\/pre>\n
      Output:<\/strong><\/p>\n
      10<\/div>\n
      Syntax for ternary operation using a dictionary<\/h3>\n
      {True: true_value, False: false_value}[conditional_expression]<\/pre>\n
      Here, the true_value and false_value become the values of the keys True and False respectively. If the conditional_expression<\/strong> evaluates to True, the value corresponding to True gets returned<\/strong>. Else, the value corresponding to False gets returned.<\/p>\n
      Example:<\/strong><\/p>\n
      >>> nice_weather = False\n>>> s = {True: \"Go out for a walk\", False: \"Watch a movie at home\"}[nice_weather]\n>>> print(s)\n<\/pre>\n
      Output:<\/strong><\/p>\n
      Watch a movie at home
      \n>>><\/div>\n
      Summary<\/h3>\n
      This brings us to the end of the article. We learned about various ways to implement ternary operations<\/strong> in Python. We saw how ternary operators increase the code readability<\/strong> and make it compact<\/strong>.<\/p>\n
      Make use of ternary operators in your code to make it more \u201cPythonic\u201d<\/strong>!<\/p>\n","protected":false},"excerpt":{"rendered":"
      Python\u2019s if-else statements are very easy to write and read. But they come with a downside. That is, if you want to print something based on some condition, you need 4 lines to do...<\/p>\n","protected":false},"author":1,"featured_media":79375,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1053],"tags":[3003,3004,3005],"class_list":["post-79309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python-ternary","tag-python-ternary-operator","tag-ternary-operator-in-python"],"yoast_head":"\nTernary Operator in Python with Examples - TechVidvan<\/title>\n<meta name=\"description\" content=\"Learn what are ternary operators in python and its uses. 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