# Write a python Class to calculate area of a rectangle and print the area - Python

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### Write a python Class to calculate area of a rectangle and print the area

``````class rectangle():
def __init__(self,breadth,length):
self.breadth=breadth
self.length=length
def area(self):
return self.breadth*self.length
a=6
b=4
obj=rectangle(a,b)
print("Area of rectangle:",obj.area())
``````

### Write a python Class to calculate area of a circle and print the vale for a radius

``````class CircleArea():
def __init__(self,radius):
self.radius=radius
def area(self):
return 3.14 * self.radius * self.radius
a=6
obj=CircleArea(a)
print("Area of rectangle:",obj.area())
``````

### Write a python Class to calculate Perimeter of a circle and print the vale for a radius

``````class CirclePerimeter():
def __init__(self,radius):
self.radius=radius
def perimeter(self):
return 2 * 3.14 * self.radius
a=6
obj=CirclePerimeter(a)
print("Perimeter of rectangle:",obj.perimeter())
``````

### Write a python Class to print All Possible Subsets from a Set of Distinct Integers

``````class sub:
def f1(self, s1):
return self.f2([], sorted(s1))

def f2(self, curr, s1):
if s1:
return self.f2(curr, s1[1:]) + self.f2(curr + [s1[0]], s1[1:])
return [curr]
a=[2, 3, 5, 6, 4, 5]

print("Subsets: ")
print(sub().f1(a))
``````

### Write a python program to Read and print the Contents of a File

``````a=str(input("Enter file name .txt extension:"))
file2=open(a,'r')
line=file2.readline()
while(line!=""):
print(line)
line=file2.readline()
file2.close()
``````

### Write a python program to Count and print the Number of Words in a Text File

``````fname = input("Enter file name: ")

num_words = 0

with open(fname, 'r') as f:
for line in f:
words = line.split()
num_words += len(words)
print("Number of words:")
print(num_words)
``````

### Write a python program to Count the Number of Lines in a Text File

``````fname = input("Enter file name: ")
num_lines = 0
with open(fname, 'r') as f:
for line in f:
num_lines += 1
print("Number of lines:")
print(num_lines)
``````

### Write a python program to Count the Occurrences of a Word in a Text File

``````fname = input("Enter file name: ")
word='the'
k = 0

with open(fname, 'r') as f:
for line in f:
words = line.split()
for i in words:
if(i==word):
k=k+1
print(f"Frequency of Occurrences of the word {a} is:")
print(k)
``````

### Write a python function to Copy the Contents of One File into Another

``````def copy(from_file, to_file):
with open(from_file) as f:
with open(to_file, "w") as f1:
for line in f:
f1.write(line)
``````

### Write a python function that Counts the Number of Times a Certain Letter Appears in the Text File

``````def count_letter(fname, l):
k = 0
with open(fname, 'r') as f:
for line in f:
words = line.split()
for i in words:
for letter in i:
if(letter==l):
k=k+1
return k
``````

### Write a python function that Print all the Numbers Present in the Text File

``````def print_number(fname):
with open(fname, 'r') as f:
for line in f:
words = line.split()
for i in words:
for letter in i:
if(letter.isdigit()):
print(letter)
``````

### Write a python function that Counts the Number of Blank Spaces in a Text File

``````def count_blank_space(fname):
k = 0
with open(fname, 'r') as f:
for line in f:
words = line.split()
for i in words:
for letter in i:
if(letter.isspace):
k=k+1
return k
``````

### Write a python function that Capitalize the First Letter of Every Word in the File

``````def capitalize(fname):
with open(fname, 'r') as f:
for line in f:
l=line.title()
print(l)
``````

### Write a python function that prints the Contents of a File in Reverse Order

``````def reverse_content(filename):
for line in reversed(list(open(filename))):
print(line.rstrip())
``````

### Write a python Program to Flatten and print a List

``````a=[[1,[[2]],[[[3]]]],[[4],5]]
flatten=lambda l: sum(map(flatten,l),[]) if isinstance(l,list) else [l]
print(flatten(a))
``````