Problem scenario
You try to run a pipenv command, but you get an error about “tomlkit.exception”.

Solution
Copy the Pipfile to a new name (to back it up). Delete the original Pipfile. Try to run the command again. If it still fails, try removing pipenv by uninstalling it. Then reinstall pipenv. Then reboot the computer.

…

Continue reading “How Do You Troubleshoot the pipenv error message “tomlkit.exception”?”

Problem scenario
You want to write a palindrome tester function in Python without the :: operator in the code (that reverses the order of the list). What do you do?

Solution

def palindrome_tester(s):
s = s.lower()
x = len(s) // 2
for i in range(x):
if s[i] == s[-(i+1)]:
pass
else:
return False
return True

var_string = “mmnMM”

if (palindrome_tester(var_string)):
print(var_string + ” is a palindrome!”)
else:
print(var_string + ” is NOT a palindrome!”) …

Continue reading “How Do You Write a Palindrome Tester Function in Python?”

Problem scenario
You want to quit a function, or return out of it, when a certain condition is met. How do you do this?

Solution
This program illustrates how it is done. You will want to run the program twice, once by leaving the “5” as it is, and a second time by changing the “5” to “6”.

def cool(x):
if x == 5:
return “There was equivalence”
else:
y = x
print(“This statement is printing as an illustration”)
return “The comparison was NOT equivalent”

var1 = cool(5)
print(var1) …

Continue reading “How Do You Escape or Break from a Method in Python?”

Problem scenario
You are trying to run a Python program with a class. You get this message:

File “foobar.py”, line 11, in
class Building(param1, param2):
NameError: name ‘param1’ is not defined

What should you do?

Solution
Use the word “object” instead of one or more parameters that you are passing in the parentheses () of the class.

…

Continue reading “How Do You Troubleshoot the Python Error “NameError: name ” is not defined”?”

Problem scenario
You are trying to install Python 3 but you get a message about zlib. This is the full message:

rm /usr/local/lib/python3.9/lib-dynload/_sysconfigdata__linux_x86_64-linux-gnu.py
rm -r /usr/local/lib/python3.9/lib-dynload/__pycache__
/bin/install -c -m 644 ./Misc/python.man \
/usr/local/share/man/man1/python3.9.1
if test “xupgrade” != “xno” ; then \
case upgrade in \
upgrade) ensurepip=”–altinstall –upgrade” ;; \
install|*) ensurepip=”–altinstall” ;; \
esac; \
./python -E -m ensurepip \
$ensurepip –root=/ ; \
fi
Traceback (most recent call last):
File “<frozen zipimport”, …

Continue reading “How Do You Troubleshoot “ModuleNotFoundError: No module named ‘zlib’”?”