Numpy 简明教程

NumPy - String Functions

以下函数用于对数据类型为 numpy.string_ 或 numpy.unicode_ 的数组执行矢量化字符串运算。它们基于 Python 内置库中的标准字符串函数。

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

这些函数在字符数组类 (numpy.char) 中被定义。较早的 Numarray 包含 chararray 类。numpy.char 类中的上述函数可用于执行矢量化字符串操作。

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.