Problem scenario
You know that Python has a feature for documentation strings that can print out when your program runs. How does it work as comments and as something that is displayed at the time the code is executed?

Solution
To best illustrate how one works, create a file called test.py with this code and run it:

def cool_function(n):
”’This is an example of a docstring. …

Continue reading “How Does a Python Docstring Work?”

Question
You have seen messages when coding in Python about iterable and subscriptable. What is the difference between these two?

Answer
A subscriptable does not necessarily use the iter method, but an iterable always does.

A subscriptable object in Python leverages the getitem() method, but it may or may not use the iter method.

…

Continue reading “What Is The Difference between Iterable and Subscriptable in Python?”

Problem scenario
You want to display a specific number of places after the decimal (e.g., one, two or three) with numeric values in Python. You want the decimal value to be rounded if it is too long. How do you always show (including trailing zeroes) a specific number of places to the right of the decimal point?

Solution
This Python 3 program will illustrate how:

x=123.45678
y=”{:.3f}”.format(x)
print(y)

a=123
b=”{:.1f}”.format(a)
print(b) …

Continue reading “How Do You Display a Fixed Number of Numbers after the Decimal Point in Python?”

Problem scenario
You run a pip command (e.g., pip –version), but ou get an error like this:

Traceback (most recent call last):
File “/home/mike/.local/bin/pip”, line 7, in
from pip._internal.cli.main import main
File “/home/mike/.local/lib/python3.*/site-packages/pip/_internal/cli/main.py” , line 60
sys.stderr.write(f”ERROR: {exc}”)

You no longer want to use Python 2 in on the server. What should you do?

Solution

1.a.

…

Continue reading “How Do You Troubleshoot the pip Message ‘sys.stderr.write(f”ERROR: {exc}”)’?”

Problem scenario
You want to instantiate a class with default values if the class was called to create an object without all the settings. You want to verify you know how to code this basic object-oriented programming feature. You want to print out specific member variables of an object. How do you do this?

Solution
Use this program:

#!/bin/python3

class Computer(object):
def __init__(self, …

Continue reading “How Do You Use a Class in Python to Test The __init__ Constructor’s Default Settings?”

Problem scenario
You are running a Python program with the “strip” string manipulation method. You get this problem:

<built-in method strip of str object at 0x7fc87bf4a0f0>

What should you do?

Solution
Did you remember to use the parentheses “()” with your strip call?

print(x.strip) can return “<built-in method strip of str object at 0x7fc87bf4a0f0>”

print(x.strip()) will return the intended value. …

Continue reading “How Do You Troubleshoot the Python Error “built-in method strip of str object at 0x7fc87bf4a0f0”?”

Problem scenario
You want to use bisect in Python. How do you do this?

Solution

# This program was adapted from code found
# https://docs.python.org/3/library/bisect.html

import bisect
def grade(score, breakpoints=[60, 70, 80, 90], grades=’FDCBA’):
i = bisect.bisect(breakpoints, score)
return grades[i]

x = [grade(score) for score in [71, 88, 94]]
print(x)

import bisect
def whether(temperature, breakpoints=[38, 70, 80, 100], descriptors=[”cold”, “cool”, “warm”, …

Continue reading “How Do You Use the Bisect Module in Python?”

Problem scenario
You have a list called cool_list. You use the .sort method. But the list is not getting alphabetized. How do you sort the strings alphabetically in the list?

Solution
Remember to use .sort(). Those last parentheses “()” are necessary.

…

Continue reading “Why Is a Python List’s Sort Feature/Command Not Working?”