Python Basic Programs-2

1.  Write a Python program to remove leading zeros from an IP address.

import re

ip = "216.08.094.196"

string = re.sub('\.[0]*', '.', ip)

print(string)

2. Write a Python program to check for a number at the end of a string

import re  

def end_num(string):  

    text = re.compile(r".*[0-9]$")  

    if text.match(string):  

        return True  

    else:  

        return False    

print(end_num('abcdef'))  

print(end_num('abcdef6'))

3. Write Python program to search the numbers (0-9) of length between 1 to 3 in a given string.

import re  

results = re.finditer(r"([0-9]{1,3})", "Exercises number 1, 12, 13, and 345 are important")  

print("Number of length 1 to 3")  

for n in results:  

     print(n.group(0))

4. Write a Python program to find the substrings within a string

import re

text = 'Python exercises, PHP exercises, C# exercises'

pattern = 'exercises'

for match in re.findall(pattern, text):

    print('Found "%s"' % match)

5. Write a Python program to find the occurrence and position of the substrings within a string

import re

text = 'Python exercises, PHP exercises, C# exercises'

pattern = 'exercises'

for match in re.finditer(pattern, text):

    s = match.start()

    e = match.end()

    print('Found "%s" at %d:%d' % (text[s:e], s, e))

     

6. Write a Python program to replace whitespaces with an underscore and vice versa

import re

text = 'Python Exercises'

text =text.replace (" ", "_")

print(text)

text =text.replace ("_", " ")

print(text)

7. Write a Python program to extract year, month and date from an url.

import re  

def extract_date(url):  

        return re.findall(r'/(\d{4})/(\d{1,2})/(\d{1,2})/', url)  

url1= "https://www.washingtonpost.com/news/football-insider/wp/2016/09/02/odell-beckhams-fame-rests-on-one-stupid-little-ball-josh-norman-tells-author/"  

print(extract_date(url1))

8. Write a Python program to convert a date of yyyy-mm-dd format to dd-mm-yyyy format

import re

def change_date_format(dt):

        return re.sub(r'(\d{4})-(\d{1,2})-(\d{1,2})', '\3-\2-\1', dt)

dt1 = "2026-01-02"

print("Original date in YYY-MM-DD Format: ",dt1)

print("New date in DD-MM-YYYY Format: ",change_date_format(dt1))

9.Write a Python program to match if two words from a list of words starting with letter 'P'.

import re

# Sample strings.

words = ["Python PHP", "Java JavaScript", "c c++"]

for w in words:

        m = re.match("(P\w+)\W(P\w+)", w)

        # Check for success

        if m:

            print(m.groups())

10. Write a Python program to separate and print the numbers of a given string

import re

# Sample string.

text = "Ten 10, Twenty 20, Thirty 30"

result = re.split("\D+", text)

# Print results.

for element in result:

    print(element)

11. Write a Python program to find all words starting with 'a' or 'e' in a given string

import re

# Input.

text = "The following example creates an ArrayList with a capacity of 50 elements. Four elements are then added to the ArrayList and the ArrayList is trimmed accordingly."

#find all the words starting with ‘a’ or ‘e’

list = re.findall("[ae]\w+", text)

# Print result.

print(list)

12. Write a Python program to separate and print the numbers and their position of a given string.

import re

# Input.

text = "The following example creates an ArrayList with a capacity of 50 elements. Four elements are then added to the ArrayList and the ArrayList is trimmed accordingly."

for m in re.finditer("\d+", text):

    print(m.group(0))

    print("Index position:", m.start())

13. Write a Python program to abbreviate 'Road' as 'Rd.' in a given string

import re

street = '21 Ramkrishna Road'

print(re.sub('Road$', 'Rd.', street))

14. Write a Python program to replace all occurrences of space, comma, or dot with a colon

import re

text = 'Python Exercises, PHP exercises.'

print(re.sub("[ ,.]", ":", text))

15. Write a Python program to find all five characters long word in a string

import re

text = 'The quick brown fox jumps over the lazy dog.'

print(re.findall(r"\b\w{5}\b", text))

16 Write a Python program to find all three, four, five characters long words in a string.

import re

text = 'The quick brown fox jumps over the lazy dog.'

print(re.findall(r"\b\w{3,5}\b", text))

17. Write a Python program to remove multiple spaces in a string

import re

text1 = 'Python      Exercises'

print("Original string:",text1)

print("Without extra spaces:",re.sub(' +',' ',text1))

18.Write a Python program to remove all whitespaces from a string

import re

text1 = ' Python Exercises '

print("Original string:",text1)

print("Without extra spaces:",re.sub(r'\s+', '',text1))

19. Write a Python program to implement pow(x, n).

class py_solution:

    def pow(self, x, n):

        if not n:

            return 1

        if n > 1:

            return eval("{}{}".format(x,"*{}".format(x)*(n-1)))

        if n < 1:

            return eval("1/({}{})".format(x, "*{}".format(x) * (-n - 1)))

print(py_solution().pow(2, -3));

print(py_solution().pow(3, 5));

print(py_solution().pow(100, 0));

            

20. Write a Python class named Circle constructed by a radius and two methods which will compute the area and the perimeter of a circle

class Circle():

    def __init__(self,r):

        self.radius = r

    def area(self):

        return self.radius**2*3.14

    def perimeter(self):

        return 2*self.radius*3.14

NewCircle = Circle(8)

print(NewCircle.area())

print(NewCircle.perimeter())

22.Write a Python program to remove duplicates from Dictionary

dict = {'one': 1, 'two': 2, 'three': 3, 'four': 1}

#print(dict)

#print(dict.items())

res = {}

for key,value in dict.items():

    if value not in res.values():

        res[key] = value

print(res)

23. Write a Python program to check a dictionary is empty or not.

my_dict = {}

if not bool(my_dict):

    print("Dictionary is empty")

else:

    print("Dictionary is not empty")

24.Write a Python program to combine two dictionary adding values for common keys

from collections import Counter

d1 = {'a': 100, 'b': 200, 'c':300}

d2 = {'a': 300, 'b': 200, 'd':400}

d = Counter(d1) + Counter(d2)

print(d)

25. Write a Python program to print all unique values in a dictionary.

L = [{"V":"S001"}, {"V": "S002"}, {"VI": "S001"}, {"VI": "S005"}, {"VII":"S005"}, {"V":"S009"},{"VIII":"S007"}]

print("Original List: ",L)

u_value = set( val for dic in L for val in dic.values())

print("Unique Values: ",u_value)

26.Write a Python program to sort a dictionary by key.

color_dict = {'red' : 1, 'blue': 2, 'orange': 3}

print(color_dict)

print(sorted(color_dict))

for key in sorted(color_dict):

    print("%s : %s" % (key, color_dict[key]))

27.Write a Python program to sum all the items in a dictionary.

dict = {'n1': 1, 'n2': 2, 'n3': 3}

print(sum(dict.values()))