{"id":117575,"date":"2020-09-05T07:51:18","date_gmt":"2020-09-05T07:51:18","guid":{"rendered":"https:\/\/blog.finxter.com\/?p=12724"},"modified":"2020-09-05T07:51:18","modified_gmt":"2020-09-05T07:51:18","slug":"python-one-line-function-definition","status":"publish","type":"post","link":"https:\/\/sickgaming.net\/blog\/2020\/09\/05\/python-one-line-function-definition\/","title":{"rendered":"Python One Line Function Definition"},"content":{"rendered":"

A lambda function allows you to define a function in a single line. It starts with the keyword lambda<\/code>, followed by a comma-separated list of zero or more arguments, followed by the colon and the return expression. For example, lambda x, y: x+y<\/code> calculates the sum of the two argument values x+y<\/code> in one line of Python code.<\/p>\n

Problem<\/strong>: How to define a function in a single line of Python code?<\/p>\n

Example<\/strong>: Say, you’ve got the following function in three lines. How to compress them into a single line of Python code?<\/p>\n

def say_hi(*friends): for friend in friends: print('hi', friend) friends = ['Alice', 'Bob', 'Ann']\nsay_hi(*friends)\n<\/pre>\n
The code defines a function say_hi<\/code> that takes an iterable as input—the names of your friends—and prints 'hi x'<\/code> for each element x<\/code> in your iterable. <\/p>\n
The output is:<\/p>\n
'''\nhi Alice\nhi Bob\nhi Ann '''<\/pre>\n
Let’s dive into the different methods to accomplish this! First, here’s a quick interactive overview to test the waters:<\/p>\n