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Python Articles
Page 159 of 852
max() and min() in Python
Finding maximum and minimum values from a given list of values is a very common need in data processing programs. Python has these two functions which handle both numbers and strings. We will see both the scenarios in the below examples.Numeric ValuesWe take a list of numeric values which has integers and floats. The functions work appropriately to give both the max and the min values.Examplex=[10, 15, 25.5, 3, 2, 9/5, 40, 70] print("Maximum number is :", max(x)) print("Minimum number is :", min(x))OutputRunning the above code gives us the following result:Maximum number is : 70 Minimum number is : 1.8String ...
Read MorePython - Column summation of tuples
Python has extensive availability of various libraries and functions which make it so popular for data analysis. We may get a need to sum the values in a single column for a group of tuples for our analysis. So in this program we are adding all the values present at the same position or same column in a series of tuples.It can be achieved in the following ways.Using for loop and zipUsing the for loop we loop through each item and apply zip function to gather the values from each column. Then we apply the sum function and finally get ...
Read MoreAll possible permutations of N lists in Python
If we have two lists and we need to combine each element of the first element with each element of the second list, then we have the below approaches.Using For LoopIn this straight forward approach we create a list of lists containing the permutation of elements from each list. we design a for loop within another for loop. The inner for loop refers to the second list and Outer follow refers to the first list.ExampleA = [5, 8] B = [10, 15, 20] print ("The given lists : ", A, B) permutations = [[m, n] for m in A ...
Read MorePython - Filter even values from a list
As part of data analysis require to filter out values from a list meeting certain criteria. In this article we'll see how to filter out only the even values from a list.We have to go through each element of the list and divide it with 2 to check for the remainder. If the remainder is zero then we consider it as an even number. After fetching these even numbers from a list we will put a condition to create a new list which excludes this even numbers. That new list is the result of the filtering condition we applied.Using for ...
Read MorePython - Filter the negative values from given dictionary
As part of data analysis, we will come across scenarios to remove the negative values form a dictionary. For this we have to loop through each of the elements in the dictionary and use a condition to check the value. Below two approaches can be implemented to achieve this.Using for loopW simply loop through the elements of the list using a for loop. In every iteration we use the items function to compare the value of the element with the 0 for checking negative value.Exampledict_1 = {'x':10, 'y':20, 'z':-30, 'p':-0.5, 'q':50} print ("Given Dictionary :", str(dict_1)) final_res_1 = ...
Read MoreTwo Sum in Python
Suppose we have an array of integers. We have to return the indices of two integers, such that if we add them up, we will reach to a specific target that is also given. Here we will take one assumption, that is always there will be one unique solution in the array, so no two set of indices for same target will be there.For an example, suppose the array is like A = [2, 8, 12, 15], and the target sum is 20. Then it will return indices 1 and 2, as A[1] + A[2] = 20.To solve this, we ...
Read MoreLongest Common Prefix in Python
Suppose we have a set of strings in an array. We have to find the Longest Common Prefix amongst the string in the array. Here we will assume that all strings are lower case strings. And if there is no common prefix, then return “”.So if the array of a string is like ["school", "schedule", "Scotland"], then the Longest Common Prefix is “sc” as this is present in all of these string.To solve this, we will take the first string as curr, now take each string from the array and read them character by character, and check the characters between ...
Read MoreMerge Two Sorted Lists in Python
Suppose we have two sorted lists A and B. We have to merge them and form only one sorted list C. The size of lists may different.For an example, suppose A = [1,2,4,7] and B = [1,3,4,5,6,8], then merged list C will be [1,1,2,3,4,4,5,6,7,8]We will solve this using recursion. So the function will work like below −Suppose the lists A and B of function merge()if A is empty, then return B, if B is empty, then return Aif value in A
Read MoreImplement strStr() in Python
Suppose we have two strings str and sub_str. We have to find the first occurrence of sub_str in the str. So if the string str is “helloworld”, and substring is “lo”, then the result will be 3.This can be done using the strstr() function in C. We have to design another function that is similar to the strstr() in C.To solve this, follow these steps −i := 0, j := 0, m := length of sub_str and n := length of strif m = 0, then return 0while i < n and n – i + 1 = m, doif ...
Read MoreMaximum Subarray in Python
Suppose we have an integer array A. We have to find the contiguous subarrays which length will be at least one, and that has the largest sum, and also return its sum. So if the array A is like A = [-2, 1, -3, 4, -1, 2, 1, -5, 4], then the sum will be 6. And the subarray will be [4, -1, 2, 1]To solve this we will try to use the Dynamic programming approach.define an array dp same as the size of A, and fill it with 0dp[0] := A[0]for i = 1 to the size of A ...
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