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scope of python
The document explains the concept of variable scope in Python, detailing how variables can be defined globally or locally and how their usage differs based on their definitions. It covers key terms such as global keywords, non-local descriptors, and the LEGB rule, which outlines the hierarchy of namespaces in Python. Additionally, it discusses how non-local variables function in nested scopes and the significance of closures.
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Discussion on defining variables in Python, including global and local variables, and the LEGB rules regarding variable scope.
Final notes on the presentation, mentioning the historical significance of the content and providing a training resource link.
scope of python
- 2. If you knowPython or any other programming language, you probably know that the variables must be defined before they can be used in your program. The variable must be used in different ways depending on how and where it is determined. Some of the variables are defined globally, others locally. This means that a variable referring to a specific part of the program may refer to another part of the program.
- 3. Define aPython function variable inside or outside global keywords non-local descriptor Closed Python LEGB in the rules
- 4. Define a Pythonfunction variable inside or outside If you specify a variable at the top of the script, it is a global variable. This means that it can be used for any of the manuals, including in a function. See the following example, where a is defined globally.
- 5. The keyword world Overall,it tells Python to use a globally defined variable instead, which will be determined locally. If you want to use it, just write in the global and the name of the variable. In this case, the name of the global variable can now change the name of the change () is used.
- 6. non-local descriptor The nonlocalexpression is useful for nested operations. This makes the variable refer to the variable previously limited to the variable closest to the fence. In other words, you avoid the variable to try to link the first to the local level and force it to reach the "higher" level.
- 7. Closed Python You closethe function objects that store the values of the closed areas, even if they are no longer in memory. LEGB in the rules As we have seen in the past, namespaces can be independent of one another and have certain levels of the hierarchy, referenced in their scope.
- 8. Depending on whereyou are in the program, they are used in different namespaces. You can specify the order in which Python uses the name, you can use LEGB in the rules. LEGB means: local attached global integrated
- 9. some of thisconclusion may have grown a bit narrow. In deference, I’ve removed all the “postscript” updates that appeared here in prior editions. This edition retains the conclusion itself, though, partly because of its historical value (python online training)
- 10.