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Articles by Jayashree
Page 2 of 2
How to Find the Power of a Number Using Recursion in Python?
Following program accepts a number and index from user. The recursive funcion rpower() uses these two as arguments. The function multiplies the number repeatedly and recursively to return power.Exampledef rpower(num,idx): if(idx==1): return(num) else: return(num*rpower(num,idx-1)) base=int(input("Enter number: ")) exp=int(input("Enter index: ")) rpow=rpower(base,exp) print("{} raised to {}: {}".format(base,exp,rpow))OutputHere is a sample run −Enter number: 10 Enter index: 3 10 raised to 3: 1000
Read MoreHow to Multiply Two Matrices using Python?
Multiplication of two matrices is possible only when number of columns in first matrix equals number of rows in second matrix.Multiplication can be done using nested loops. Following program has two matrices x and y each with 3 rows and 3 columns. The resultant z matrix will also have 3X3 structure. Element of each row of first matrix is multiplied by corresponding element in column of second matrix.ExampleX = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] Y = [[10, 11, 12], [13, 14, 15], ...
Read MoreHow to Find Sum of Natural Numbers Using Recursion in Python?
If a function calls itself, it is called a recursive function. In order to prevent it from falling in infinite loop, recursive call is place in a conditional statement.Following program accepts a number as input from user and sends it as argument to rsum() function. It recursively calls itself by decrementing the argument each time till it reaches 1.def rsum(n): if n
Read MoreHow does modulus work with complex numbers in Python?
Floor and modulus operators (// and % respectively) are not allowed to be used on complex number in Python 3.x. However, these operations are defined for complex numbers in Python 2.7.xPython 3>>> x=9+2j >>> y=2+1j >>> x%y Traceback (most recent call last): File "", line 1, in x%y TypeError: can't mod complex numbers.Python 2.7>>> x=9+2j >>> y=2+1j >>> x%y (1-2j)Modulus of complex number operands returns their floor division multiplied by denominator>>> x-(x//y)*y (1-2j)
Read MoreHow to Swap Two Variables using Python?
By using a temporary variable −>>> x=10 >>> y=20 >>> z=x >>> x=y >>> y=z >>> x,y (20, 10)Without using temporary variable>>> a,b=5,7 >>> a,b (5, 7) >>> a,b=b,a >>> a,b (7, 5)
Read MoreHow to Find the Sum of Natural Numbers using Python?
You can use while loop to successively increment value of a variable i by one and adding it cumulatively.s,i=0,0 n=10 while i
Read MoreHow to generate armstrong numbers in Python?
Any three digit number is called an Armstrong number of sum of cube of its digits equals the number itself. In order to check if a number satisfies this condition, each digit from it is successively separated from right and its cube is cumulatively added. In the end if the sum is found to be equal to original number, it is called Armstrong number.ExampleFollowing Python code prints all armstrong numbers between 100 to 999for num in range(100, 1000): temp=num sum=0 while temp>0: digit=temp%10 sum=sum+digit**3 temp=temp//10 if sum==num: ...
Read MoreHow to extract subset of key-value pairs from Python dictionary object?
Use dictionary comprehension technique.We have dictionary object having name and percentage of students>>> marks = { 'Ravi': 45.23, 'Amar': 62.78, 'Ishan': 20.55, 'Hema': 67.20, 'Balu': 90.75 }To obtain dictionary of name and marks of students with percentage>50>>> passed = { key:value for key, value in marks.items() if value > 50 } >>> passed {'Amar': 62.78, 'Hema': 67.2, 'Balu': 90.75}To obtain subset of given names>>> names = { 'Amar', 'Hema', 'Balu' } >>> lst = { key:value for key,value in marks.items() if key in names} >>> lst {'Amar': 62.78, 'Hema': 67.2, 'Balu': 90.75}
Read MoreHow to create a Python dictionary from text file?
Assuming a following text file (dict.txt) is present1 aaa2 bbb3 cccFollowing Python code reads the file using open() function. Each line as string is split at space character. First component is used as key and second as valued = {} with open("dict.txt") as f: for line in f: (key, val) = line.split() d[int(key)] = val print (d)The output shows contents of file in dictionary form{1: 'aaa', 2: 'bbb', 3: 'ccc'}
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