I am trying to figure out how to append multiple values to a list in Python. I know there are few methods to do so, such as manually input the values, or put the append operation in a for loop, or the append and extend functions. However, I wonder if there is neater way to do so? Maybe a certain package or function?

Sep 19, 2012 · Your line q.append(s) is at the same indentation level as the main part of the function, which means it only executes after the end of the for loop. Move it one level to the right, so it goes with the rest of the body of the loop, and it'll be executed each time through the loop.

Append mode will make the operating system put every write, at the end of the file irrespective of where the writer thinks his position in the file is. This is a common issue for multi-process services like nginx or apache where multiple instances of the same process, are …

Sep 5, 2012 · This variable is updated in a loop. When I try to do this with a list.append command, it updates every value in the list with the new value of the variable. How should I do it? while (step < maxstep): for i in range(100): x = a*b*c f1 += x f2.append(f1) print f2 raw_input('<<') step += 1 Expected output

If you are running the command from a POSIX-compliant shell, like bash, you can set the environment variable like this: PYTHONPATH="/path/to" python somescript.py somecommand If it's all on one line, the PYTHONPATH environment value applies only to that one command.

Jun 25, 2017 · letter = raw_input("please enter a letter") letters.append(letter) You were probably entering a letter like d when asked for input when it actually should have been "d" (which will append properly). raw_input will always convert your letter to a string, so you may enter it like d. Please read over the difference:

The problem is that if I use sys.path.append(mod_directory) to append the path and then open the python interpreter, the directory mod_directory gets added to the end of the list sys.path. If I export the PYTHONPATH variable before opening the python interpreter, the directory gets added to the start of the list. In the latter case I can import ...

Dec 14, 2010 · The reason is that Python strings are immutable, so repeatedly using s += more will allocate lots of successively larger strings. .join will generate the final string in one go from its constituent parts.

for i in b: a.append(i) is more wordy, and slower than a.extend(b), which is single function call and more idiomatic. append is slower because of the semantics with which memory is allocated and grown for lists. See here for a similar discussion.

Aug 12, 2013 · We can use .append() to change the list S and add elements from the list T. Lists S, and T are two separate objects with two different addresses in the memory. With the function id() you can check that. T = [1, 2, 3] print(id(T)) S = list() print(S) print(id(S)) for t in T: S.append(t) print(S) print(id(S)) Result: