Friday, July 20, 2018

NumPy - String Functions

NumPy - String Functions


The following functions are used to perform vectorized string operations for arrays of dtype numpy.string_ or numpy.unicode_. They are based on the standard string functions in Python's built-in library.
Sr.No.Function & Description
1add()
Returns element-wise string concatenation for two arrays of str or Unicode
2multiply()
Returns the string with multiple concatenation, element-wise
3center()
Returns a copy of the given string with elements centered in a string of specified length
4capitalize()
Returns a copy of the string with only the first character capitalized
5title()
Returns the element-wise title cased version of the string or unicode
6lower()
Returns an array with the elements converted to lowercase
7upper()
Returns an array with the elements converted to uppercase
8split()
Returns a list of the words in the string, using separatordelimiter
9splitlines()
Returns a list of the lines in the element, breaking at the line boundaries
10strip()
Returns a copy with the leading and trailing characters removed
11join()
Returns a string which is the concatenation of the strings in the sequence
12replace()
Returns a copy of the string with all occurrences of substring replaced by the new string
13decode()
Calls str.decode element-wise
14encode()
Calls str.encode element-wise
These functions are defined in character array class (numpy.char). The older Numarray package contained chararray class. The above functions in numpy.char class are useful in performing vectorized string operations.

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