{"id":47803,"date":"2020-06-05T15:14:00","date_gmt":"2020-06-05T19:14:00","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=47803"},"modified":"2022-11-21T09:45:40","modified_gmt":"2022-11-21T14:45:40","slug":"python-function-tutorial-part-ix","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/python-function-tutorial-part-ix\/","title":{"rendered":"Python Function Tutorial \u2013 Part IX"},"content":{"rendered":"\n

See the previous installment in this series, DocStrings<\/a>, to get up-to-date in this tutorial.<\/em><\/p>\n\n\n\n

Nested Python functions and non-local variable<\/strong><\/p>\n\n\n\n

A nested Python function is a function that is defined inside another function. The syntax for the nested function is the same as that of any other Python function. Though the applications of nested functions are complex in nature and limited at times, even in the quant domain, it is worth mentioning, as we might encounter this out there in the wild. Below is an example which demonstrates the nested Python functions.<\/p>\n\n\n\n

\n# Defining nested function
\ndef outer():
\n “”” This is an enclosing function “””
\n def inner():
\n “”” This is a nested function “””
\n print(‘Got printed from the nested function.’)
\n print(‘Got printed from the outer function.’)
\n inner() \n<\/p>\n\n\n\n

We define the Python function outer<\/code> which nests another Python function inner<\/code> within it. The outer<\/code> function is referred to as an enclosing<\/em> function and inner<\/code> is known as nested<\/em> function. They are also referred to as inner<\/em> functions sometimes. Upon calling the outer<\/code> function, Python will, in turn, call the inner<\/code> function nested inside it and execute it. The output for the same is shown below:<\/p>\n\n\n\n

\n# Calling the ‘outer’ function
\nouter()
\n# Output
\nGot printed from the outer function.
\nGot printed from the nested function.
\n<\/p><\/p>\n\n\n\n

The output we got here is intuitive. First, the print<\/code> statement within the outer<\/code> function got executed, followed by the print<\/code> statement in the inner<\/code> function. Additionally, nested functions can access variables of the enclosing functions. i.e. variables defined in the outer function can be accessed by the inner function. However, the inner or the nested Python function cannot modify the variables defined in the outer or enclosing Python function.<\/p>\n\n\n\n

\ndef outer(n):
\n number = n
\n def inner():
\n print(‘Number =’, number)
\n inner()\n<\/p>\n\n\n\n

A call to outer<\/code> function will print the following<\/p>\n\n\n\n

\nouter(5)
\n# Output
\nNumber = 5
\n<\/p>\n\n\n\n

Though the variable number<\/code> is not defined within inner<\/code> function, it is able to access and print the number<\/code>. This is possible because of scope mechanism that Python provided. We discuss more on this in the following section. Now consider, what if we want the nested Python function to modify the variable that is declared in the enclosing Python function. The default behavior of Python does not allow this. If we try to modify it, we will be presented with an error. To handle such a situation, the keyword nonlocal<\/code> comes to the rescue.<\/p>\n\n\n\n

In the nested Python function, we use the keyword nonlocal<\/code> to create and change the variables defined in the enclosing Python function. In the example that follows, we alter the value of the variable number<\/code>.<\/p>\n\n\n\n

\ndef outer(n):
\n number = n
\n def inner():
\n nonlocal number
\n number = number ** 2
\n print(‘Square of number =’, number)
\n print(‘Number =’, number)
\n inner()
\n print(‘Number =’, number)\n<\/p>\n\n\n\n

A call to the outer<\/code> Python function will now print the number passed as an argument to it, the square of it and the newly updated number (which is nothing but the squared number only).<\/p>\n\n\n\n

\nouter(3)
\n# Output
\nNumber = 3
\nSquare of number = 9
\nNumber = 9
\n<\/p>\n\n\n\n

Remember, assigning a value to a variable will only create or change the variable within a particular Python function (or a scope) unless they are declared using the nonlocal statement.<\/p>\n\n\n\n

In the next installment, the author will provide code for Variable Namespace and Scope<\/em>.<\/p>\n\n\n\n

Visit https:\/\/www.quantinsti.com\/<\/a> for ready-to-use Python functions as applied in trading and data analysis.<\/p>\n","protected":false},"excerpt":{"rendered":"

Join QuantInsti for a tutorial on Nested Python functions and non-local variables. Find out how assigning a value to a variable affects a particular Python function (or a scope). <\/p>\n","protected":false},"author":328,"featured_media":44932,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,343,349,338,350,341,344],"tags":[851,5615,806,5614,852,7739,595],"contributors-categories":[13654],"class_list":{"0":"post-47803","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-programing-languages","9":"category-python-development","10":"category-ibkr-quant-news","11":"category-quant-asia-pacific","12":"category-quant-development","13":"category-quant-regions","14":"tag-algo-trading","15":"tag-argument","16":"tag-data-science","17":"tag-lambda","18":"tag-machine-learning","19":"tag-nested-python-functions","20":"tag-python","21":"contributors-categories-quantinsti"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"\nPython Function Tutorial \u2013 Part IX | IBKR Quant<\/title>\n<meta name=\"description\" content=\"Join QuantInsti for a tutorial on Nested Python functions and non-local variables. 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