CBSE class 12 Computer science Python practicals program|Stacks class 12 computer science programs|Data structure python programs
Introduction
In this blog you will find three major CS class 12 practical programs. Other programs will also be uploaded soon.
1) Read a text file and display the number of uppercase/lowercase characters in the file.
2) Python program to read a text file and display the number of vowels/consonants in the file.
3) Python program to implement a stack data structure.
Source code(for 1st program)-
f=open( "path of file",'r')
C_upper=0
C_lower=0
ch=f.read()
for i in ch:
if i.isupper():
C_upper+=1
if i.islower():
C_lower+=1
print("Number of Uppercase alphabets is/are : ",C_upper,'\n',"and number of lowercase alphabets are:",C_lower)
#-------------code ended-----------
About the Code-
- You need to paste the path of your file in line 1 as instructed. Otherwise it may give an error.
- Read():- The read() function in Python is a pre-defined function that returns the read data as a string.
- isupper():- This is a built-in method used for string handling. This method returns true if all characters in the string are uppercase, otherwise, "false".
- islower() :- This is a built-in method which is used for string handling. The islower() method returns true if all characters in the string are lowercase, otherwise returns "false". The operators used in the program are:
- f.read()
- for loop
- i.isupper()
- islower()
- print()
Source code(for 2nd program)-
#you have to paste the path of file in the given space before executing it
file=open('path of file',"r")
vowels = set("AEIOUaeiou")
constant=set("bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ")
text=file.read()
countV=0
countC=0
for V in text:
if V in vowels:
countV +=1
if V in constant:
countC+=1
print("The number of Vowels is:",countV,"\nThe number of consonants is: ",countC)
#-------------code ended-----------
You need to paste the path of your file in line 1 as instructed. Otherwise it may give an error.
Source code(for 3rd program)-
stack=[]
choice='yes'
while choice=='yes':
print('1.PUSH')
print('2.POP')
print('3.Display elements of stack')
choice1=int(input("what do you want to perform?:"))
if choice1==1:
a=int(input("Enter the element which you want to push : "))
stack.append(a)
elif choice1==2:
if stack==[]:
print("Stack is empty..... Underflow")
else:
print("deleted element is :",stack.pop())
elif choice1==3:
for i in range(len(stack)-1,-1,-1):
print(stack[i])
else :
print("invalid input")
choice=input("want perform more functions?Yes or no")
if choice=='no':
break
#code ended
What are Stacks?
Stack is a linear data structure that follows a particular sequence of LIFO (Last In First Out) or FILO (First In Last Out). We can perform many functions in this data structure.
Some real life examples are :- Stack of plates, stack of books one by one.
To learn more about Stacks and Another program based on list data structure (stack and queue):--https://learntechpython.blogspot.com/2021/07/write-python-program-to-implement-stack.html
"Hope it helped"
Have anything in mind? Let me
know in the comment section👇
Have anything in mind? Let me
know in the comment section👇
