In RStudio, function variables, parameters or arguments are displayed by pressing tab.
While VSCode has a lot of features, I cannot find a similar one for Python.
I found a way for VSCode to show me the definition of the function while hovering in the function itself, but there are no autocompletion for the actual variables of that function (nor suggestions while writing). Besides, the tooltips close itself as soon as I start typing the variables.
Is there a way to get something more similar regarding autocompletion and suggestion of function variables in VSCode while using Python?
Thanks.
According to your description, it is recommended that you use the extension "Pylance", which provides outstanding language service functions.
Its 'Docstrings' and 'auto-completion' functions show us the function parameters and will not close the prompt when inputting:
Part of its function introduction:
Related
Is there a way to exclude parameters being autocompleted in IntelliSense?
I have used IntelliJ before, and I recently switched over to VS Code. Upon switching and installing IntelliSense, I have had issues with some of the autocompletes. For example, on tab completion of the print function, I would just expect it to complete as:
print()
but it instead completes as:
print(sep=..., end=..., file=..., flush=...)
Only for some functions does the autocomplete include the parameter suggestions, and not for other, and I cant seem to figure out why. I tried looking through the settings but without much luck. Any help?
VS is code is now the most popular code editor and I love it.
When you hover your mouse over a function, it shows you the function signature and help doc string.
When you decorate a function, its help docstring changes to that of the wrapper's. ( to understand what I mean read this↗️ )
In python 3.4+ This is fixed by using functools.wrap as shown here.( Please read ⬅️ that to better understand my problem.) I am not writing because its well explained there.
But when I hover over the function in VS Code, it shows the docstring of the wrapper.
How can I make VS code show the docstring of the original function ?
VS Code (newer pylance server ) has become smart and it now does the correct thing! by default.
I am trying to track down when a variable gets updated. I have a watcher, but is there any way to set it up so that the execution can be paused when the value is getting updated?
This is called a watchpoint or a data breakpoint.
Currently pycharm does not have a default built-in feature that tracks variable modification in real time. Alternatively you can do this:
run debug
From debugger pane -> Variables, right click the variable you would like to track and and add it to Watches.
In Watches pane, right click the variable and select referring objects.
The feature you are talking about is, I believe, called watchpoint support and according to this article:
http://sourceforge.net/blog/watchpoints-in-python/
Eric and PyScriptor has the feature but not pycharm.
Checkout watchpoints:
watchpoints is an easy-to-use, intuitive variable/object monitor tool for python that behaves similar to watchpoints in gdb.
An answer to How do you watch a variable in pdb describes how it compares to other approaches and why it's favorable.
As for better integration with pycharm, see Support other debuggers like pydevd
Regarding built-in python support and performance impact, see:
Add C hook in PyDict_SetItem for debuggers
add support for watching writes to selected dictionaries
Further notes are available on other questions on SO:
How can I make PyCharm break when a variable takes a certain value? "without modifying my code"
Is there a way to set a breakpoint on variable access in Python with PyDev? concerns a global variable
How to trigger function on value change? combining observable with breakpoint() or pydevd.settrace() might be a solution if more control is needed
Is there a free python debugger that has watchpoints? [closed, "asking us to recommend"]
Lastly, I repeat the proposal to vote for Support Data breakpoints PyCharm issue.
You can add a breakpoint in the line you need to watch and right-click it.
Then in the dialog box you have "condition" as last input: add a condition that uses the variable you need and it should stop when you set it to.
I'm using IPython qtconsole under windows 7, and when I first write a method name and type the bracket, a popup shows method parameters.
What is the way to display that popup explicitly, once it has disappeared? This is pretty common 'show method parameters' shortcut that I'm talking about, but I've failed to find the shortcut to it after an embarrassing amount of google searches.
In Spyder, try View - Panes - Object inspector. Then type the full name of the function.
I would highly recommend relying on the Python Library Reference rather than any in-IDE tools, at least for functions and classes that are in the standard library. For objects outside those libraries however... it looks like you can type object_name followed by a question mark, that is, object_name?, to get a list of informative details about the object. (Since everything is an object, this presumably includes functions.)
For your specific question, it looks, from the iPython docs, like the TAB key is what you're looking for, but somehow I doubt you haven't already tried that.
Is there a way for PyCharm to show where a given Python function is called from?
I currently rely on simply searching for the function name across the project and this often works fine, but if a function name is vague there are a lot of incorrect hits. I'm wondering if I'm missing a feature somewhere, e.g. perhaps the search results could be further narrowed down to only show where modules import the module I'm searching from?
In PyCharm you can select a function and press Alt+Shift+F7 to run a usage search. It's also available under "Edit → Find → Find Usages". It looks like it's more intelligent than a text search.
Using static analysis to find where a function is called from is difficult in general in Python because it uses dynamic binding and has a lot of introspection so it's very easy to get false positives miss usages. In the case of module-level functions I think a good solution is to always use module.function to call the function and never do a from module import function. That way you can do a text search for 'module.function'. Python style guides generally recommend that you import functions etc. in this way so I think this is generally accepted good practice.
Finding method calls is of course much harder. One of the things I like about developing in Java and C# is being able to find all usages of a method by static analysis.
Press the Ctrl key and simultaneously hover your mouse over the function header.The function name should get highlighted.Click on the function name to get a list of all instances where the function is called.
If you press the Ctrl key and simultaneously hover your mouse over a function call, then the function name will be highlighted and clicking on it will take you to the function definition.