when to use functions in python and when not to? - Stack Overflow
2018年8月12日 · Functions are a way of compartmentalizing code such that it makes it both easier to read and easier to manage. In this case, there are a few concepts you must understand before implementing functions to solve your problem. Functions follow the format:
In Python, when should I use a function instead of a method?
The Zen of Python states that there should only be one way to do things- yet frequently I run into the problem of deciding when to use a function versus when to use a method. Let's take a trivial example- a ChessBoard object.
What does -> mean in Python function definitions? - Stack Overflow
2013年1月17日 · In more detail, Python 2.x has docstrings, which allow you to attach a metadata string to various types of object. This is amazingly handy, so Python 3 extends the feature by allowing you to attach metadata to functions describing their parameters and return values. There's no preconceived use case, but the PEP suggests several.
python - Why do some functions have underscores "__" before …
In Python, the use of an underscore in a function name indicates that the function is intended for internal use and should not be called directly by users. It is a convention used to indicate that the function is "private" and not part of the public API of the module.
What does the “at” (@) symbol do in Python? - Stack Overflow
2011年6月17日 · Functions, in Python, are first class objects - which means you can pass a function as an argument to another function, and return functions. Decorators do both of these things. If we stack decorators, the function, as defined, gets passed first to the decorator immediately above it, then the next, and so on.
python - How do I call a function from another .py file ... - Stack ...
#Import defined functions from myfun import * #Call functions Print_Text() c=Add(1,2) Solution2: if this above solution did not work for Colab. Create a foldermyfun; Inside this folder create a file __init__.py; Write all your functions in __init__.py; Import …
python - How to use a global variable in a function? - Stack Overflow
In Python, the module is the natural place for global data: Each module has its own private symbol table, which is used as the global symbol table by all functions defined in the module. Thus, the author of a module can use global variables in the module without worrying about accidental clashes with a user’s global variables.
Call a python function from jinja2 - Stack Overflow
2011年5月17日 · To call a python function from Jinja2, you can use custom filters which work similarly as the globals. It's quite simple and useful. In a file myTemplate.txt, I wrote: {{ data | pythonFct }} And in a python script: import jinja2 def pythonFct(data): return "This is my data: {0}".format(data) input="my custom filter works!"
When is it good to use nested functions in Python?
One disadvantage of nested functions is when it comes to testing. def compute_sequence(sequence): """Compute blabla on sequence""" def compute_element(element): """Compute blabla on element""" return element * 2 sequence = sequence + 1 # global treatment return [compute_element(element) for element in sequence]
What is the naming convention in Python for variables and …
PEP 8 is a guideline, not a law. It is an option on top of Python, not part of the official language. If everybody uses the same style, this would be preferred in a bigger company. All my Python programs at home run perfect with camelCaseNames, I will not change this unless people can prove my code is runner slower or has wrong behavior.