What is debugging

For whimsical reasons, programming errors are called bugs and the process of tracking them down is called debugging. Three kinds of errors can occur in a program syntax errors, runtime errors, and semantic errors. It is useful to distinguish between them in order to track them down more quickly. Python can only execute a program if the syntax is correct otherwise, the interpreter displays an error message. Syntax refers to the structure of a program and the rules...

Infinite recursion

If a recursion never reaches a base case, it goes on making recursive calls forever, and the program never terminates. This is known as infinite recursion, and it is generally not a good idea. Here is a minimal program with an infinite recursion In most programming environments, a program with infinite recursion does not really run forever. Python reports an error message when the maximum recursion depth is reached RuntimeError Maximum recursion depth exceeded RuntimeError Maximum recursion...

The Python programming language

The programming language you will learn is Python. Python is an example of a high-level language other high-level languages you might have heard of are C, C , Perl, and Java. There are also low-level languages, sometimes referred to as machine languages or assembly languages. Loosely speaking, computers can only execute programs written in low-level languages. So programs written in a high-level language have to be processed before they can run. This extra processing takes some time, which is a...

Exercise 12.3 Write A Function Called Most Frequent That Takes A String And Prints The Letters In Decreasing Order Of

Exercise 12.3 Write a function called most_frequent that takes a string and prints the letters in decreasing order of frequency. Find text samples from several different languages and see how letter frequency varies between languages. Compare your results with the tables at wikipedia.org wiki Letter_frequencies. 1. Write a program that reads a word list from a file see Section 9.1 and prints all the sets of words that are anagrams. Here is an example of what the output might look like 'deltas',...

Write A Function Called Is Sorted That Takes A List As A Parameter And Returns True If The List Is Sorted In Ascending

Exercise 10.3 Write a function called is_sorted that takes a list as a parameter and returns True if the list is sorted in ascending order and False otherwise. You can assume as a precondition that the elements of the list can be compared with the comparison operators lt , gt , etc. For example, is_sorted 1,2,2 should return True and is_sorted 'b', 'a' should return False. Exercise 10.4 Two words are anagrams if you can rearrange the letters from one to spell the other. Write a function called...