Coding Problems

Implement a BankAccount class with deposit/withdraw methods

Create a Rectangle class with area and perimeter methods

Add text to the end of an existing file

Remove empty lines from a file

Count the number of words in a text file

Copy contents of one file to another

Count the number of lines in a text file

Create a dictionary showing how many times each element appears in a list

Find the key with the maximum value in a dictionary

Combine two dictionaries into one (second dict overwrites first on conflict)

Sort list of tuples by their second element

Remove all instances of given element from list

Find second largest number in list

Rotate list left by k positions (elements wrap around)

Count how many times each word appears in sentence

Check if two strings are anagrams (same characters different order)

Remove duplicate characters from string while preserving order

Generate sequence: if n even → n/2, if odd → 3n+1, until 1

Print all prime numbers between 1 and 100

Print diamond star pattern with 2n-1 rows