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lambda example

0 likes • Nov 19, 2022
Python
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Topological sort

CodeCatch
0 likes • Nov 19, 2022
Python
#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()

Propositional logic with itertools

AustinLeath
0 likes • Nov 18, 2022
Python
from itertools import product
V='∀'
E='∃'
def tt(f,n) :
xss=product((0,1),repeat=n)
print('function:',f.__name__)
for xs in xss : print(*xs,':',int(f(*xs)))
print('')
# p \/ (q /\ r) = (p \/ q) /\ (p \/ r)
def prob1(p,q,r) :
x=p or (q and r)
y= (p or q) and (p or r)
return x==y
tt(prob1,3)
# p/\(q\/r)=(p/\q)\/(p/\r)
def prob2(p,q,r) :
x=p and ( q or r )
y=(p and q) or (p and r)
return x==y
tt(prob2,3)
#~(p/\q)=(~p\/~q)
def prob3(p,q) :
x=not (p and q)
y=(not p) or (not q)
return x==y
tt(prob3,2)
#(~(p\/q))=((~p)/\~q)
def prob4(p, q):
x = not(p or q)
y = not p and not q
return x == y
tt(prob4, 2)
#(p/\(p=>q)=>q)
def prob5(p,q):
x= p and ( not p or q)
return not x or q
tt(prob5,2)
# (p=>q)=((p\/q)=q)
def prob6(p,q) :
x = (not p or q)
y=((p or q) == q)
return x==y
tt(prob6,2)
#((p=>q)=(p\/q))=q
def prob7(p,q):
if ((not p or q)==(p or q))==q:
return 1
tt(prob7,2)
#(p=>q)=((p/\q)=p)
def prob8(p,q):
if (not p or q)==((p and q)==p):
return 1
tt(prob8,2)
#((p=>q)=(p/\q))=p
def prob9(p,q):
if ((not p or q)==(p and q))==p:
return '1'
tt(prob9,2)
#(p=>q)/\(q=>r)=>(p=>r)
def prob10(p,q,r) :
x = not ((not p or q) and (not q or r)) or (not p or r)
return x
tt(prob10, 3)
# (p = q) /\ (q => r) => (p => r)
#answer 1
def prob11(p,q,r) :
x = not((p is q) and (not q or r)) or (not p or r)
return x
tt(prob11, 3)
#(p=q)/\(q=>r)=>(p=>r)
#answer 2
def prob11(p,q,r):
x=(p==q) and (not q or r)
y=not p or r
return not x or y
tt(prob11,3)
#((p=>q)/\(q=r))=>(p=>r)
def prob12(p,q,r):
x=(not p or q) and ( q==r )
y=not p or r
return not x or y
tt(prob12,3)
#(p=>q)=>((p/\r)=>(q/\r))
def prob13(p,q,r):
x=not p or q
y=(not(p and r) or ( q and r))
return not x or y
tt(prob13,3)
#Question#2----------------------------------------
#(p=>q)=>r=p=>(q=>r)
def prob14(p,q,r):
x=(not(not p or q) or r)
y=(not p or (not q or r))
return x==y
tt(prob14,3)
def prob15(p, q):
x = not(p and q)
y = not p and not q
return x == y
tt(prob15, 2)
def prob16(p, q):
x = not(p or q)
y = not p or not q
return x == y
tt(prob16, 2)
def prob17(p):
x = p
y = not p
return x == y
tt(prob17, 1)

Calculator

CodeCatch
0 likes • Nov 19, 2022
Python
""" 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

Mad libs generator

CodeCatch
0 likes • Nov 19, 2022
Python
#Loop back to this point once code finishes
loop = 1
while (loop < 10):
#All the questions that the program asks the user
noun = input("Choose a noun: ")
p_noun = input("Choose a plural noun: ")
noun2 = input("Choose a noun: ")
place = input("Name a place: ")
adjective = input("Choose an adjective (Describing word): ")
noun3 = input("Choose a noun: ")
#Displays the story based on the users input
print ("------------------------------------------")
print ("Be kind to your",noun,"- footed", p_noun)
print ("For a duck may be somebody's", noun2,",")
print ("Be kind to your",p_noun,"in",place)
print ("Where the weather is always",adjective,".")
print ()
print ("You may think that is this the",noun3,",")
print ("Well it is.")
print ("------------------------------------------")
#Loop back to "loop = 1"
loop = loop + 1

screencap.py

asnark
0 likes • Jan 23, 2021
Python
"""
Take screenshots at x interval - make a movie of doings on a computer.
"""
import time
from datetime import datetime
import ffmpeg
import pyautogui
while True:
epoch_time = int(time.time())
today = datetime.now().strftime("%Y_%m_%d")
filename = str(epoch_time) + ".png"
print("taking screenshot: {0}".format(filename))
myScreenshot = pyautogui.screenshot()
myScreenshot.save(today + "/" + filename)
time.sleep(5)
#
# and then tie it together with: https://github.com/kkroening/ffmpeg-python/blob/master/examples/README.md#assemble-video-from-sequence-of-frames
#
"""
import ffmpeg
(
ffmpeg
.input('./2021_01_22/*.png', pattern_type='glob', framerate=25)
.filter('deflicker', mode='pm', size=10)
.filter('scale', size='hd1080', force_original_aspect_ratio='increase')
.output('movie.mp4', crf=20, preset='slower', movflags='faststart', pix_fmt='yuv420p')
.run()
)
"""

read file contents into a list

CodeCatch
0 likes • Jun 1, 2023
Python
filename = "data.txt"
with open(filename, "r") as file:
file_contents = file.readlines()
file_contents = [line.strip() for line in file_contents]
print("File contents:")
for line in file_contents:
print(line)