Returning Variables in Functions Python Not Working Right Question: I have been trying to return a variable in a function in a variable and use it outside of it: test = 0 def testing(): test = 1 return test testing() print(test) But when I run it, the result is 0. How could I fix this …
python function not returning a list Question: I can’t figure out why my implementation of Reverse Cuthill–McKee algorithm is returning at the wrong place. Basically, it produces the correct result, but when I run the code, it returns a different value. Here is a full code with a graph, could some one please explain this …
store return value of a Python script in a bash script Question: I want to execute a python script from a bash script, and I want to store the output of the python script in a variable. In my python script, I print some stuff to screen and at the end I return a string …
How can I return two values from a function in Python? Question: I would like to return two values from a function in two separate variables. For example: def select_choice(): loop = 1 row = 0 while loop == 1: print(”’Choose from the following options?: 1. Row 1 2. Row 2 3. Row 3”’) row …
How to get the return value from a thread? Question: The function foo below returns a string ‘foo’. How can I get the value ‘foo’ which is returned from the thread’s target? from threading import Thread def foo(bar): print(‘hello {}’.format(bar)) return ‘foo’ thread = Thread(target=foo, args=(‘world!’,)) thread.start() return_value = thread.join() The "one obvious way to …
Is it ok to skip "return None"? Question: I wonder if it is bad manner to skip return None, when it is not needed. Example: def foo1(x): if [some condition]: return Baz(x) else: return None def foo2(x): if [some condition]: return Baz(x) bar1 = foo1(x) bar2 = foo2(x) In both cases, when condition is false, …
Returning None or a tuple and unpacking Question: I am always annoyed by this fact: $ cat foo.py def foo(flag): if flag: return (1,2) else: return None first, second = foo(True) first, second = foo(False) $ python foo.py Traceback (most recent call last): File “foo.py”, line 8, in <module> first, second = foo(False) TypeError: ‘NoneType’ …
How to call an external program in python and retrieve the output and return code? Question: How can I call an external program with a python script and retrieve the output and return code? Asked By: cfischer || Source Answers: Look at the subprocess module: a simple example follows… from subprocess import Popen, PIPE process …
Is it pythonic for a function to return multiple values? Question: In python, you can have a function return multiple values. Here’s a contrived example: def divide(x, y): quotient = x/y remainder = x % y return quotient, remainder (q, r) = divide(22, 7) This seems very useful, but it looks like it can also …
