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Question 1: take a string of odd length greater than 7 and extract middle three chars?


Ex:
getMid3("DataScience") → "Sci"
getMid3("Machine") → "chi"


Solution
import numpy as np
def getMid3(TestStr):
	Mid_Indx = int(len(TestStr) /2)
	print("Org :", TestStr)
	Mid3 = TestStr[Mid_Indx-1:Mid_Indx+2]
	print("Middle 3 chars :", Mid3)
getMid3("DataScience")
getMid3("Machine")

Output

>>>
Org : DataScience
Middle 3 chars : Sci
Org : Machine
Middle 3 chars : chi

Q 2: Given 2 strings, s1 and s2, create a new string by appending s2 in the middle of s1?


Ex:
addInMid("MachinesLearning", "are") → "MachinesareLearning"


def addInMid(s1, s2):
Mid_Indx = int(len(s1) /2)
print("Org: ", s1, s2)
Mid3 = s1[:Mid_Indx-1:]+ s2 +s1[Mid_Indx-1:]
print("After inserting new str : ", Mid3)

addInMid("MachinesLearning", "are")

>>>
Org: MachinesLearning are
After inserting new str : MachinesareLearning

Q 3: From 2 strings, s1 and s2 return a new one which made of the first, middle and last char of them?


For example: –
strFun("Machine", "Science") = ""MSheee"



def strFun(s1, s2):
	resultString = s1[:1] + s2[:1] + s1[int(len(s1) /2):int(len(s1) /2)+1] +s2[int(len(s2) /2):int(len(s2) /2)+1] +s1[len(s1)-1] + s2[len(s2)-1]
	print("Mixed Str is ", resultString)
s1 = "Machine"
s2 = "Science"
strFun(s1, s2)

>>>
Mixed Str is MSheee

Q 4: In a Given input String arrange characters such that all lowercase letters should come first?


Ex:
lowercaseFirst("PythonClass") = ythonlassPC


        inputStr = " PythonClass "
words = inputStr.split()
lower = []
upper = []
for char in inputStr:
	if char.islower():
		lower.append(char)
	else:
		upper.append(char)
sortedStr = ''.join(lower + upper)
print("\n final str with lowercase letters comes first:")
print(sortedStr)

>>>
final str with lowercase letters comes first
ythonlassPC

Q 5: Given an input string Count all lower case, upper case, digits, and special symbols?


Ex:
myFun("D@#zo28ne^$j4pr") = Chars = 8 Digits = 3 Symbol = 4


def myFun(str):
	words = str.split()
	charCnt = 0
	digitCnt = 0
	symbCnt = 0
	for char in str:
		if char.islower() or char.isupper():
			charCnt+=1
		elif char.isnumeric():
			digitCnt+=1
		else:
			symbCnt+=1

print("Chars = ", charCnt, "Digits = ", digitCnt, "Symbol = ", symbCnt)

str = "D@#zo28ne^$j4pr"
print(" total counts of chars, digits,and symbols")
print(myFun(str))

>>>
total counts of chars, digits,and symbols
Chars = 8 Digits = 3 Symbol = 4

Question 6: Given two strings, s1 and s2, create a mix String?
(create a third-string made of the first char of the last char of b, the second char of the second last char of b, and so on. Any leftover chars go at the end of the result.)


Ex:
strFun("DZoneJpr", "Website") = DeZtoinsebJepWr


def strFun(s1, s2):
s2 = s2[::-1]
lengthS1 = len(s1)
lengthS2 = len(s2)
length = lengthS1 if lengthS1 > lengthS2 else lengthS2 
resultString=""
for i in range(length):
if(i < lengthS1):
resultString = resultString + s1[i]
if(i < lengthS2):
resultString = resultString + s2[i]

print(resultString)

s1 = "DZoneJpr"
s2 = "Website"
strFun(s1, s2)

>>>
Mix String is DeZtoinsebJepWr

Question 7: String characters balance Test?

We’ll say that a String s1 and s2 is balanced if all the chars in the string1 are there in s2. characters position doesn’t matter.


For example: –
BalStr(zr, Dzonejpr) = True


def BalStr(s1, s2):
	flag = True
	for char in s1:
		if char in s2:
			continue
		else:
			flag = False
	return flag

s1 = "zr"
s2 = "Dzonejpr"
flag = BalStr(s1, s2)
print("s1 and s2 are balanced", flag)

s1 = "zrt"
s2 = "Dzonejpr"
flag = BalStr(s1, s2)
print("s1 and s2 are balanced", flag)

>>>
s1 and s2 are balanced True
s1 and s2 are balanced False

Question 8: Given a string, return the sum and average of the digits that appear in the string, ignoring all other characters?


Ex: –
sumAndAverage("English = 88 Science = 80 Math = 90 History = 60") = sum 318 Percentage is 79.5


import re

inputStr = "English = 88 Science = 80 Math = 90 History = 60"
markList = [int(num) for num in re.findall(r'\b\d+\b', inputStr)]
totalMarks = 0
for mark in markList:
	totalMarks+=mark

percentage = totalMarks/len(markList) 
print("Total Marks is:", totalMarks, "Percentage is ", percentage)

>>>
Total Marks is: 318 Percentage is 79.5

Question 9: Find all the occurrences of "Machine" in the given string ignoring the case?


For Example:
countOfOccurrences("Welcome to Machine Learning, automated Machine!") = 2


inputString = "Welcome to Machine Learning, automated Machine!"
substring = "Machine"
tempString = inputString.lower()
count = tempString.count(substring.lower())
print("count of Machine is:", count)

>>>
count of Machine is: 2

Question 10: Given a string, count occurrences of all characters within a string?


Ex: –
countChar("dzonejprdzonejprdzone") = {'d': 3, 'z': 3, 'o': 3, 'n': 3, 'e': 3, 'j': 2, 'p': 2, 'r': 2}


inputStr = "dzonejprdzonejprdzone"
countDict = dict()
for char in inputStr:
count = inputStr.count(char)
countDict[char]=count
print(countDict)

>>>
{'d': 3, 'z': 3, 'o': 3, 'n': 3, 'e': 3, 'j': 2, 'p': 2, 'r': 2}

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Important Links

Question 1: take a string of odd length greater than 7 and extract middle three chars?
`Ex: getMid3("DataScience") → "Sci" getMid3("Machine") → "chi"`

Solution

Output

Q 2: Given 2 strings, s1 and s2, create a new string by appending s2 in the middle of s1?
`Ex: addInMid("MachinesLearning", "are") → "MachinesareLearning"`

Q 3: From 2 strings, s1 and s2 return a new one which made of the first, middle and last char of them?
`For example: – strFun("Machine", "Science") = ""MSheee"`

Q 4: In a Given input String arrange characters such that all lowercase letters should come first?
`Ex: lowercaseFirst("PythonClass") = ythonlassPC`

Q 5: Given an input string Count all lower case, upper case, digits, and special symbols?
`Ex: myFun("D@#zo28ne^$j4pr") = Chars = 8 Digits = 3 Symbol = 4`

Question 6: Given two strings, s1 and s2, create a mix String?
(create a third-string made of the first char of the last char of b, the second char of the second last char of b, and so on. Any leftover chars go at the end of the result.)
`Ex: strFun("DZoneJpr", "Website") = DeZtoinsebJepWr`

Question 7: String characters balance Test?
We’ll say that a String s1 and s2 is balanced if all the chars in the string1 are there in s2. characters position doesn’t matter.

`For example: – BalStr(zr, Dzonejpr) = True`

Question 8: Given a string, return the sum and average of the digits that appear in the string, ignoring all other characters?
`Ex: – sumAndAverage("English = 88 Science = 80 Math = 90 History = 60") = sum 318 Percentage is 79.5`

Question 9: Find all the occurrences of "Machine" in the given string ignoring the case?
`For Example: countOfOccurrences("Welcome to Machine Learning, automated Machine!") = 2`

Question 10: Given a string, count occurrences of all characters within a string?
`Ex: – countChar("dzonejprdzonejprdzone") = {'d': 3, 'z': 3, 'o': 3, 'n': 3, 'e': 3, 'j': 2, 'p': 2, 'r': 2}`

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