numpy string operations | count() function Last Updated : 23 Jan, 2019 Comments Improve Suggest changes Like Article Like Report numpy.core.defchararray.count(arr, sub, start=0, end=None) is another function for doing string operations in numpy.It returns an array with the number of non-overlapping occurrences of substring sub in the range start to end. Parameters: arr : array_like of str or unicode. sub : [str or unicode] The substring which to be searched. start : [ int, optional] The starting location in each string. end : [ int, optional] The ending location in each string. Returns : [ndarray] the number of non-overlapping occurrences of substring sub. Code #1 : Python3 # Python program explaining # numpy.char.count() method # importing numpy as geek import numpy as geek # input arrays in_arr = geek.array(['Sayantan', ' Sayan ', 'Sayansubhra']) print ("Input array : ", in_arr) # output arrays out_arr = geek.char.count(in_arr, sub ='an') print ("Output array: ", out_arr) Output: Input array : ['Sayantan' ' Sayan ' 'Sayansubhra'] Output array: [2 1 1] Code #2 : Python3 # Python program explaining # numpy.char.count() method # importing numpy as geek import numpy as geek # input arrays in_arr = geek.array(['Sayantan', ' Sayan ', 'Sayansubhra']) print ("Input array : ", in_arr) # output arrays out_arr = geek.char.count(in_arr, sub ='a', start = 1, end = 8) print ("Output array: ", out_arr) Output: Input array : ['Sayantan' ' Sayan ' 'Sayansubhra'] Output array: [3 2 2] Comment More infoAdvertise with us Next Article numpy string operations | count() function jana_sayantan Follow Improve Article Tags : Python Python-numpy Python numpy-String Operation Practice Tags : python Similar Reads numpy.count() in Python numpy.core.defchararray.count(arr, substring, start=0, end=None): Counts for the non-overlapping occurrence of sub-string in the specified range. Parameters: arr : array-like or string to be searched. substring : substring to search for. start, end : [int, optional] Range to search in. Returns : An 1 min read Numpy str_len() function numpy.char.str_len(arr) function is used for doing string operations in numpy. It returns the length of every string element wise. Parameters: arr : array_like of str or unicode.Input array. Returns : [ndarray] Output Array of integer. Code #1 : Python3 # Python program explaining # numpy.char.str_l 1 min read Python | Operator.countOf Operator.countOf() is used for counting the number of occurrences of b in a. It counts the number of occurrences of value. Syntax : Operator.countOf(freq = a, value = b) Parameters : freq : It can be list or any other data type which store value value : It is value for which we have to count the num 2 min read Numpy count_nonzero method | Python numpy.count_nonzero() function counts the number of non-zero values in the array arr. Syntax : numpy.count_nonzero(arr, axis=None) Parameters : arr : [array_like] The array for which to count non-zeros. axis : [int or tuple, optional] Axis or tuple of axes along which to count non-zeros. Default is 1 min read Python | Pandas Series.str.count() Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric Python packages. Pandas is one of those packages and makes importing and analyzing data much easier. Pandas str.count() method is used to count occurrence of a string or regex pattern in 3 min read Count Substrings with number of 0s and 1s in ratio of X : Y Given a binary string S, the task is to count the substrings having the number of 0s and 1s in the ratio of X : Y Examples: Input: S = "010011010100", X = 3, Y = 2Output: 5Explanation: The index range for the 5 substrings are: (0, 4), (2, 6), (6, 10), (7, 11), (2, 11) Input: S = "10010101", X = 1, Y 7 min read Count words in a given string Given a string, count the number of words in it. The words are separated by the following characters: space (' ') or new line ('\n') or tab ('\t') or a combination of these. Recommended PracticeCount number of wordsTry It!Method 1: The idea is to maintain two states: IN and OUT. The state OUT indica 15+ min read Count occurrences of a character in string in Python We are given a string, and our task is to count how many times a specific character appears in it using Python. This can be done using methods like .count(), loops, or collections.Counter. For example, in the string "banana", using "banana".count('a') will return 3 since the letter 'a' appears three 2 min read Python String isnumeric() Method The isnumeric() method is a built-in method in Python that belongs to the string class. It is used to determine whether the string consists of numeric characters or not. It returns a Boolean value. If all characters in the string are numeric and it is not empty, it returns “True†If all characters i 3 min read Python len() Function The len() function in Python is used to get the number of items in an object. It is most commonly used with strings, lists, tuples, dictionaries and other iterable or container types. It returns an integer value representing the length or the number of elements. Example:Pythons = "GeeksforGeeks" # G 2 min read Like