NumPy – String Functions
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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 |
|---|---|
| 1 | add()
Returns element-wise string concatenation for two arrays of str or Unicode |
| 2 | multiply()
Returns the string with multiple concatenation, element-wise |
| 3 | center()
Returns a copy of the given string with elements centered in a string of specified length |
| 4 | capitalize()
Returns a copy of the string with only the first character capitalized |
| 5 | title()
Returns the element-wise title cased version of the string or unicode |
| 6 | lower()
Returns an array with the elements converted to lowercase |
| 7 | upper()
Returns an array with the elements converted to uppercase |
| 8 | split()
Returns a list of the words in the string, using separatordelimiter |
| 9 | splitlines()
Returns a list of the lines in the element, breaking at the line boundaries |
| 10 | strip()
Returns a copy with the leading and trailing characters removed |
| 11 | join()
Returns a string which is the concatenation of the strings in the sequence |
| 12 | replace()
Returns a copy of the string with all occurrences of substring replaced by the new string |
| 13 | decode()
Calls str.decode element-wise |
| 14 | encode()
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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