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Jun 1, 2023CodeCatch
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More Python Posts

Delete all even numbers

Nov 19, 2022CodeCatch

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# Deleting all even numbers from a list
a = [1,2,3,4,5]
del a[1::2]
print(a)

Create a Floyd’s Triangle

May 31, 2023CodeCatch

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def generate_floyds_triangle(num_rows):
triangle = []
number = 1
for row in range(num_rows):
current_row = []
for _ in range(row + 1):
current_row.append(number)
number += 1
triangle.append(current_row)
return triangle
def display_floyds_triangle(triangle):
for row in triangle:
for number in row:
print(number, end=" ")
print()
# Prompt the user for the number of rows
num_rows = int(input("Enter the number of rows for Floyd's Triangle: "))
# Generate Floyd's Triangle
floyds_triangle = generate_floyds_triangle(num_rows)
# Display Floyd's Triangle
display_floyds_triangle(floyds_triangle)

Differentiate Between type() and instance()

May 31, 2023CodeCatch

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class Rectangle:
pass
class Square(Rectangle):
pass
rectangle = Rectangle()
square = Square()
print(isinstance(rectangle, Rectangle)) # True
print(isinstance(square, Rectangle)) # True
print(isinstance(square, Square)) # True
print(isinstance(rectangle, Square)) # False

combine values

Nov 19, 2022CodeCatch

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from collections import defaultdict
def combine_values(*dicts):
res = defaultdict(list)
for d in dicts:
for key in d:
res[key].append(d[key])
return dict(res)
d1 = {'a': 1, 'b': 'foo', 'c': 400}
d2 = {'a': 3, 'b': 200, 'd': 400}
combine_values(d1, d2) # {'a': [1, 3], 'b': ['foo', 200], 'c': [400], 'd': [400]}

Topological sort

Nov 19, 2022CodeCatch

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#Python program to print topological sorting of a DAG
from collections import defaultdict
#Class to represent a graph
class Graph:
def __init__(self,vertices):
self.graph = defaultdict(list) #dictionary containing adjacency List
self.V = vertices #No. of vertices
# function to add an edge to graph
def addEdge(self,u,v):
self.graph[u].append(v)
# A recursive function used by topologicalSort
def topologicalSortUtil(self,v,visited,stack):
# Mark the current node as visited.
visited[v] = True
# Recur for all the vertices adjacent to this vertex
for i in self.graph[v]:
if visited[i] == False:
self.topologicalSortUtil(i,visited,stack)
# Push current vertex to stack which stores result
stack.insert(0,v)
# The function to do Topological Sort. It uses recursive
# topologicalSortUtil()
def topologicalSort(self):
# Mark all the vertices as not visited
visited = [False]*self.V
stack =[]
# Call the recursive helper function to store Topological
# Sort starting from all vertices one by one
for i in range(self.V):
if visited[i] == False:
self.topologicalSortUtil(i,visited,stack)
# Print contents of stack
print(stack)
g= Graph(6)
g.addEdge(5, 2);
g.addEdge(5, 0);
g.addEdge(4, 0);
g.addEdge(4, 1);
g.addEdge(2, 3);
g.addEdge(3, 1);
print("Following is a Topological Sort of the given graph")
g.topologicalSort()

Calculator

Nov 19, 2022CodeCatch

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""" Calculator
----------------------------------------
"""
def addition ():
print("Addition")
n = float(input("Enter the number: "))
t = 0 //Total number enter
ans = 0
while n != 0:
ans = ans + n
t+=1
n = float(input("Enter another number (0 to calculate): "))
return [ans,t]
def subtraction ():
print("Subtraction");
n = float(input("Enter the number: "))
t = 0 //Total number enter
sum = 0
while n != 0:
ans = ans - n
t+=1
n = float(input("Enter another number (0 to calculate): "))
return [ans,t]
def multiplication ():
print("Multiplication")
n = float(input("Enter the number: "))
t = 0 //Total number enter
ans = 1
while n != 0:
ans = ans * n
t+=1
n = float(input("Enter another number (0 to calculate): "))
return [ans,t]
def average():
an = []
an = addition()
t = an[1]
a = an[0]
ans = a / t
return [ans,t]
// main...
while True:
list = []
print(" My first python program!")
print(" Simple Calculator in python by Malik Umer Farooq")
print(" Enter 'a' for addition")
print(" Enter 's' for substraction")
print(" Enter 'm' for multiplication")
print(" Enter 'v' for average")
print(" Enter 'q' for quit")
c = input(" ")
if c != 'q':
if c == 'a':
list = addition()
print("Ans = ", list[0], " total inputs ",list[1])
elif c == 's':
list = subtraction()
print("Ans = ", list[0], " total inputs ",list[1])
elif c == 'm':
list = multiplication()
print("Ans = ", list[0], " total inputs ",list[1])
elif c == 'v':
list = average()
print("Ans = ", list[0], " total inputs ",list[1])
else:
print ("Sorry, invilid character")
else:
break