Functions
Write a function named greet that prints “Hello, world!” to the screen. Then call it.
def greet():
print("Hello, world!")
greet()
Create a list colors with 5 colors. Print each one.
colors = ["red", "blue", "green", "yellow", "purple"]
for color in colors:
print(color)
Ask user for name, write it to name.txt.
name = input("Enter your name: ")
with open("name.txt", "w") as f:
f.write(name)
Ask user for first & last name. Print full name.
first = input("First: ")
last = input("Last: ")
print(first + " " + last)
Store 3 math functions in list, apply to two numbers.
def add(x, y): return x + y
def subtract(x, y): return x - y
def multiply(x, y): return x * y
funcs = [add, subtract, multiply]
x, y = 5, 2
for f in funcs:
print(f(x, y))
Write a function square(num) that returns the square of num. Ask the user for input.
def square(num):
return num ** 2
n = int(input("Enter a number: "))
print(square(n))
Make list of 3 test scores. Change second to 100. Print list.
scores = [70, 80, 90]
scores[1] = 100
print(scores)
Read and print each line from data.txt.
with open("data.txt", "r") as f:
for line in f:
print(line.strip())
Ask for a word. Show first char, last char, and length.
word = input("Enter a word: ")
print("First:", word[0], "Last:", word[-1], "Length:", len(word))
Remove punctuation from a sentence.
import string
text = input("Enter a sentence: ")
for p in string.punctuation:
text = text.replace(p, "")
print(text)
Write calculate_total(price, tax_rate) that returns total after tax.
def calculate_total(price, tax_rate):
return price + (price * tax_rate)
p = float(input("Price: "))
t = float(input("Tax rate (e.g. 0.07): "))
print("Total:", calculate_total(p, t))
Ask for 5 integers, store in list, print sum and average.
nums = []
for i in range(5):
nums.append(int(input("Enter number: ")))
print("Sum:", sum(nums))
print("Average:", sum(nums)/len(nums))
Read values from sales.txt, compute total.
total = 0
with open("sales.txt") as f:
for line in f:
total += float(line.strip())
print("Total:", total)
Ask for sentence. Print each character on its own line.
sentence = input("Enter a sentence: ")
for char in sentence:
print(char)
Write get_positive_integer() that loops until a valid positive number is entered.
def get_positive_integer():
while True:
n = int(input("Enter positive integer: "))
if n > 0:
return n
count = get_positive_integer()
for i in range(count, 0, -1):
print(i)
Write get_user_input() to return a name, and display_welcome(name) to print it.
def get_user_input():
return input("Enter your name: ")
def display_welcome(name):
print(f"Welcome, {name}!")
name = get_user_input()
display_welcome(name)
Ask for 7 numbers. Print smallest and largest.
nums = [int(input("Enter number: ")) for _ in range(7)]
print("Min:", min(nums))
print("Max:", max(nums))
Count lines in poem.txt.
with open("poem.txt") as f:
lines = f.readlines()
print("Line count:", len(lines))
Count how many times “e” appears in a sentence.
text = input("Enter a sentence: ")
print("Count of e:", text.count('e'))
Read numbers from input.txt, double them, write to output.txt.
with open("input.txt") as infile, open("output.txt", "w") as outfile:
for line in infile:
num = float(line.strip())
outfile.write(str(num * 2) + "\n")
Write analyze_number(num) to return square, cube, and square root. Print all three.
import math
def analyze_number(num):
return num2, num3, math.sqrt(num)
n = float(input("Enter number: "))
sqr, cube, root = analyze_number(n)
print("Square:", sqr, "Cube:", cube, "Root:", root)
Remove all 0s from list, then sort.
nums = [0, 2, 0, 4, 5, 0, 3]
nums = [n for n in nums if n != 0]
nums.sort()
print(nums)
Read scores from scores.txt, find highest.
scores = [float(line.strip()) for line in open("scores.txt")]
print("Highest:", max(scores))
Print string in reverse with slicing. Show middle character too.
text = input("Enter text: ")
print("Reverse:", text[::-1])
print("Middle:", text[len(text)//2])
A VERY HARD QUESTION
just kidding