We Keep Coding

How do I call a function in vs code using python?

I'll want to know how to call a function in vs code. I read the answer to similar questions, but they don't work:
def userInput(n):
return n*n
userInput(5)
And appends nothing
def Input(n):
return n*n
And in the terminal:
from file import *
from: can't read /var/mail/file
Can somebody help me?

You are doing everything correctly in the first picture. In order to call a function in python on vs code you first have to define the function, which you did by typing def userInput(n):. If you want to see the result of your function, you should not use return, you should use print instead. Return is a keyword- so when your computer reaches the return keyword it attempts to send that value from one point in your code to another. If you want to see the result of your code, typing print (n) would work better.
Your code should look like this:
def userInput(n):
print (n * n)
userInput(5)
The code would print the result 25

Your terminal is your general way to access your operating system, so you have to tell it that you want it to interpret your Python code first.
If you want to run the file you're typing in, you have to first know the location of that file. When you type ls in your terminal, does the name of your Python file show up? If not, hover over the tab in VSCode (it's close to the top of the editor) and see what path appears. Then in your terminal type cd (short for "change directory") and then the path that you saw, minus the <your filename here>.py bit. Type ls again, and you should see your Python file. Now you can type python <your filename here>.py to run it (provided you have Python installed).
You could also run the IDLE by just typing python in your terminal. This will allow you to write your code line-by-line and immediately evaluate it, but it's easier to write in VSCode and then run it with the method I described before.

How to disable creating a new python IDLE session when compiling through Notepad++?

when I'm compiling python through Notepad++ I get a new python shell ( IDLE ) everytime, but I rather just keep one fixed window, instead of a new window on another position.
So for example, when I write a script which prints "Hello World!" and compile it so that my Python Shell displays the text, and when I modify my script to "Goodbye World!" the same shell prints that text. Or that that shell gets closed, but that at the same position a new shell emerges with the new text.
Could somebody please help me I'm having a hard time figuring this out..
Many thanks in advance!

You might have noticed, that python source code does not require a compilation to get run. Python source-code is rather beeing interpreted on-the-fly, by the language "engine".
Your issue is related with the Notepad++ settings and O/S settings.
IDLE is a program, that has typically been set in O/S as an associated-application to a set of filename-extensions ( .py, etc )
If your Notepad++ Compile does not call O/S to "launch" a file, the problem ceases to exist.
Your normal step to "run" the file then would be to just re-type inside the python terminal, whenever you have saved any code-modification in Notepad++:
>>> execfile( "<<_whatever_filename_my_python_source_has_>>" ) # local DIR
>>> execfile( "C:\\someDIR\\anotherSubDIR\\runMyPYTHON.py" ) # doubled-slashes

Running a bash file with Python

I've got a bash file that I normally execute using Cygwin.
I need to run this file from my Python code.
I tried this:
for bashfile in files:
p = Popen(bashfile, cwd=dname) #dname is the current directory of the script
stdout, stderr = p.communicate()
I've also seen a similar question here, but when trying to run it that way it says that it can't find the directory of my bash file...
Any ideas? Thanks! :-)
Edit: bashfile has a full path.

Do you need its output to get it directly to Python? If not this may be very fast and easy solution:
os.system("""here some code you use to execute in Terminal""")

You can also try this, though it does (and will no matter what you try) matter where the directory is. This, as far as the output goes, may be a little bit cleaner than the os method.
import commands
cmd="bash ./script.sh"
commands.getoutput(cmd)
If the case is that you need to change the directory:
cmd = "/path/to/your/script/script.sh"
The added benefit of using this method, versus say, os is that you can assign the output to a variable...
fun_times = commands.getoutput("bash ./script.sh")
whereas...
not_fun_times = os.system("./script.sh")
will throw an error.
etc, etc.

How to stop command prompt from closing in python?

I am very new to python.. I used the code
x = input(" Hey what is your name " )
print(" Hey, " + x)
input(" press close to exit ")
Because i have looked for this problem on internet and came to know that you have to put some dummy input line at the end to stop the command prompt from getting closed but m still facing the problem.. pls Help
I am using python 3.3

On windows, it's the CMD console that closes, because the Python process exists at the end.
To prevent this, open the console first, then use the command line to run your script. Do this by right-clicking on the folder that contains the script, select Open console here and typing in python scriptname.py in the console.
The alternative is, as you've found out, to postpone the script ending by adding a input() call at the end. This allows the user of the script to choose when the script ends and the console closes.

That can be done with os module. Following is the simple code :
import os
os.system("pause")
This will generate a pause and will ask user to press any key to continue.
[edit: The above method works well for windows os. It seems to give problem with mac (as pointed by ihue, in comments). The thing is that "os" library is operating system specific and some commands might not work with one operating system like they work in another one.]

For Windows Environments:
If you don't want to go to the command prompt (or work in an environment where command prompt is restricted), I think the following solution is gooThe solution I use is to create a bat file.
Use notepad to create a text file. In the file the contents will look something like:
my_python_program.py
pause
Then save the file as "my_python_program.bat" - DO NOT FORGET TO SELECT "All Files!
When you run the bat file it will run the python program and pause at the end to allow you to read the output. Then if you press any key it will close the window.

Just Add Simple input At The End Of Your Program it Worked For Me
input()
Try it And It Will Work Correctly

Try this,
import sys
status='idlelib' in sys.modules
# Put this segment at the end of code
if status==False:
input()
This will only stop console window, not the IDLE.

Problem with reading in parameters with special characters in Python

I have a scripts (a.py) reads in 2 parameters like this:-
#!/usr/bin/env python
import sys
username = sys.argv[1]
password = sys.argv[2]
Problem is, when I call the script with some special characters:-
a.py "Lionel" "my*password"
It gives me this error:-
/swdev/tools/python/current/linux64/bin/python: No match.
Any workaround for this?
Updated-
It has been suspected that this might be a shell issue rather than the script issue.
I thought the same too, until i tried it out on a perl script(a.pl), which works perfectly without any issue:-
#!/usr/bin/env perl
$username = $ARGV[1];
$password = $ARGV[2];
print "$username $password\n";
%a.pl "lionel" "asd*123"
==> lionel asd*123
No problem.
So i guess , this looks to me more like a PYTHON issue.
Geezzz ........

The problem is in the commands you're actually using, which are not the same as the commands you've shown us. Evidence: in Perl, the first two command-line arguments are $ARGV[0] and $ARGV[1] (the command name is $0). The Perl script you showed us wouldn't produce the output you showed us.
"No match" is a shell error message.
Copy-and-paste (don't re-type) the exact contents of your Python script, the exact command line you used to invoke it, and the exact output you got.
Some more things to watch out for:
You're invoking the script as a.py, which implies either that you're copying it to some directory in your $PATH, or that . is in your $PATH. If the latter, that's a bad idea; consider what happens if you cd info a directory that contains a (possibly malicious) command called ls. Putting . at the end of your $PATH is safer than putting it at the beginning, but I still recommend leaving it out altogether and using ./command to invoke commands in the current directory. In any case, for purposes of this exercise, please use ./a.py rather than a.py, just so we can be sure you're not picking up another a.py from elsewhere in your $PATH.
This is a long shot, but check whether you have any files in your current directory with a * character in their names. some_command asd*123 (without quotation marks) will fail if there are no matching files, but not if there happens to be a file whose name is literally "asd*123".
Another thing to try: change your Python script as follows:
#!/usr/bin/env python
print "before import sys"
import sys
print "after import sys"
username = sys.argv[1]
password = sys.argv[2]
This will tell you whether the shell is invoking your script at all.

That error comes from your shell, not from Python. Do you have a shopt -s failglob set in your .bashrc or somewhere?

/swdev/tools/python/current/linux64/bin/python: No match.
I think the problem is that the python env is not set:
Does python run at all on your machine ?