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Python practice problems help beginners to become experts in a python programming language with a small amount of practice effort.
Write a Python program to remove an element from a set.
{10, 20, 30}{10, 30}remove() raises KeyError if missing; discard() does not.s = {10, 20, 30}s.remove(20)s.discard(99)print(s){10, 30}New to this topic? Read the lesson, then come back.
Write a Python program to add elements to a set.
{1, 2}{1, 2, 3}add() for one item; adding an existing item does nothing.s = {1, 2}s.add(3)s.add(2)print(s){1, 2, 3}New to this topic? Read the lesson, then come back.
Write a Python program to create a set and show that duplicates are removed.
{8, 3, 5} 3
set 0set() for an empty set.numbers = {5, 3, 8, 3, 5}empty = set()print(numbers, len(numbers))print(type(empty).__name__, len(empty)){8, 3, 5} 3
set 0The repeated 3 and 5 are stored once.
{} would create a dictionary, so an empty set needs set().
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48 set programs: creating sets, adding and removing items, union, intersection, difference, subsets and frozensets. Sets of strings have no fixed order, so these solutions print sorted(...) whenever the order would otherwise change from run to run.
Read the Sets lesson first if the topic is new to you.
pop().EasyWrite a Python program to sort the lines of a file by their length.
x short medium line a much longer line here
sorted(lines, key=len).with open("story.txt", "w") as f: f.write("medium line\nx\na much longer line here\nshort\n") with open("story.txt") as f: lines = f.read().splitlines()for line in sorted(lines, key=len): print(line)x short medium line a much longer line here
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Write a Python program to replace every space in a file with an underscore.
learn_python_at_sqatools file_handling_demo
with open("story.txt", "w") as f: f.write("learn python at sqatools\nfile handling demo\n") with open("story.txt") as f: text = f.read()with open("story.txt", "w") as f: f.write(text.replace(" ", "_"))print(open("story.txt").read())learn_python_at_sqatools file_handling_demo
The file is read completely before it is reopened in “w” mode, because “w” empties it immediately.
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Write a Python program to display the words of a file that have fewer than 5 characters.
['is', 'a', 'very', 'good', 'tool', 'for', 'test']
len(w) < 5.with open("story.txt", "w") as f: f.write("Python is a very good tool for test automation\n") with open("story.txt") as f: print([w for w in f.read().split() if len(w) < 5])['is', 'a', 'very', 'good', 'tool', 'for', 'test']
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Write a Python program to copy a file to another file, skipping lines that contain the letter “t”.
apple cherry melon
"t" not in line.lower().with open("source.txt", "w") as f: f.write("apple\nbutter\ncherry\nmelon\ntea\n") with open("source.txt") as src, open("filtered.txt", "w") as dst: for line in src: if "t" not in line.lower(): dst.write(line)print(open("filtered.txt").read())apple cherry melon
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Write a Python program to count the consonants in a file.
16
with open("story.txt", "w") as f: f.write("Python file handling is easy\n") with open("story.txt") as f: text = f.read().lower()print(sum(ch.isalpha() and ch not in "aeiou" for ch in text))16
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Write a Python program to count the vowels in a file.
8
with open("story.txt", "w") as f: f.write("Python file handling is easy\n") with open("story.txt") as f: print(sum(ch in "aeiou" for ch in f.read().lower()))8
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