Overview: Global Variables in Python Suppose several functions need to use the same value. If each function creates its own variable, the same value must be defined separately in each function. This can lead to longer, repetitive code and make the program harder to manage. To solve this problem, Python provides global variables. Introduction: What […]
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Introduction: Variable Scope in Python A variable stores a value that a program can use later. But when a program has many functions and variables, a question can arise: where can each variable be accessed? For example, a variable created inside one function may not be available in another function. Without clear rules about where
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Introduction: Python Return Value in Functions Some functions perform a calculation or process a value that the rest of the program needs to use. For example, a function that calculates the total cost may need to give that total back so it can be stored, displayed, or used in another calculation. The Python return statement
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Introduction: Python Multiple Argument Unpacking Sometimes the values needed by a function are stored in more than one list, tuple, or dictionary. Passing every value separately can make the function call longer, especially when the values are already grouped into different collections. Python provides a simpler way to handle this situation. Python multiple argument unpacking
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Introduction: Python Argument Unpacking With Positional-Only and Keyword-Only Parameters Python Argument Unpacking With Positional-Only and Keyword-Only Parameters is useful when you need to control how unpacked values are passed to function parameters. These parameter restrictions determine whether an argument must be passed by position or by keyword. When argument unpacking is used with these parameters,
Introduction: Argument Unpacking With *args and **kwargs Sometimes a function is designed to accept a variable number of arguments using *args or **kwargs. When you already have those values stored in a collection, you can unpack the collection when calling the function. This process of Python argument unpacking with *args and **kwargs expands values from
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Introduction: Python Argument Unpacking Sometimes, a function needs values that are already in a list, tuple, or dictionary. The function, however, expects those values as separate arguments. Without argument unpacking, you need to access the values from the collection and pass them one by one. This can become inconvenient when the collection contains several values.
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Overview: **kwargs in Python [**kwargs = Variable-Length Keyword Arguments] A function can define parameters for the keyword arguments it expects. However, some functions need to accept different keyword arguments in different function calls. The Need for Variable-Length Keyword Arguments Consider a function that displays information about a person. One call may include a name and
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Overview: *args in Python A function normally defines a fixed number of parameters, so the function call must provide the expected number of arguments. However, some functions need to accept different numbers of positional arguments. To solve this need, Python provides *args. This tutorial explains what *args is, how *args works, how Python stores the
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Introduction: Positional-Only and Keyword-Only Parameters in Python A function can normally receive an argument by position or by using the parameter name. This gives the caller flexibility in how the function is called. Sometimes, however, a function should control this flexibility. A parameter may need to accept a value only by position, or it may
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