So writing “fun(1, **d)” was equivalent to writing “fun(1, b=4, c=10)”.Python Tutorial Python Features Python History Python Applications Python Install Python Example Python Variables Python Data Types Python Keywords Python Literals Python Operators Python Comments Python If else Python Loops Python For Loop Python While Loop Python Break Python Continue Python Pass Python Strings Python Lists Python Tuples Python List Vs Tuple Python Sets Python Dictionary Python Functions Python Built-in Functions Python Lambda Functions Python Files I/O Python Modules Python Exceptions Python Date Python Regex Python Sending Email Read CSV File Write CSV File Read Excel File Write Excel File Python Assert Python List Comprehension Python Collection Module Python Math Module Python OS Module Python Random Module Python Statistics Module Python Sys Module Python IDEs Python Arrays Command Line Arguments Python Magic Method Python Stack & Queue PySpark MLlib Python Decorator Python Generators Web Scraping Using Python Python JSON Python Itertools Python Multiprocessing How to Calculate Distance between Two Points using GEOPY Gmail API in Python How to Plot the Google Map using folium package in Python Grid Search in Python Python High Order Function nsetools in Python Python program to find the nth Fibonacci Number Python OpenCV object detection Python SimpleImputer module Second Largest Number in Python Here ** unpacked the dictionary used with it, and passed the items in the dictionary as keyword arguments to the function. # A sample program to demonstrate unpacking of # Convert args tuple to a list so we can modify it # A sample python function that takes three arguments # A Python program to demonstrate both packing and Since our tuples are immutable, you can convert the args tuple to a list so you can also modify, delete, and re-arrange items in i.īelow is an example that shows both packing and unpacking. args and args would give you the first and second argument, respectively. Once we have this ‘packed’ variable, we can do things with it that we would with a normal tuple. The above function mySum() does ‘packing’ to pack all the arguments that this method call receives into one single variable. When we don’t know how many arguments need to be passed to a python function, we can use Packing to pack all arguments in a tuple. > range(*args) # call with arguments unpacked from a list > range(3, 6) # normal call with separate arguments If they are not available separately, write the function call with the *-operator to unpack the arguments out of a list or tuple: TypeError: func() takes 3 positional arguments but 4 were givenĪs another example, consider the built-in range() function that expects separate start and stops arguments. of arguments must be the same as the length of the list that we are unpacking for the arguments. We can use * to unpack the list so that all elements of it can be passed as different parameters. TypeError: fun() takes exactly 4 arguments (1 given) # A sample function that takes 4 arguments If we simply pass a list to the function, the call doesn’t work. We want to make a call to this function and we have a list of size 4 with us that has all arguments for the function. We use two operators * (for tuples) and ** (for dictionaries).Ĭonsider a situation where we have a function that receives four arguments. Function Decorators in Python | Set 1 (Introduction).When to use yield instead of return in Python?.How to write an empty function in Python – pass statement?.class method vs static method in Python.Python | Difference between iterable and iterator.Python _iter_() and _next_() | Converting an object into an iterator.Using else conditional statement with for loop in python.Chaining comparison operators in Python.Programs for printing pyramid patterns in Python. ![]()
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