Learn to replace all occurrences of the first character in a string in Python 3.
Learn to add numbers in Python 3.
Learn to calculate the length of a string in Python 3.
Learn to calculate the frequency of every character in Python 3.
Learn how to find the highest common factor(HCF) or greatest common divisor(GCD) of 2 numbers in Python.
Learn tho calculate the area of a triangle in Python.
Learn to concatenate the first and last n characters of a string in Python 3.
Learn to print Hello World in Python 3.
Learn to print over the same line in Python.
Learn how to list all the files in any given directory in Python.