如何在Python中就地修改字符串？

很不幸，您无法原地修改字符串，因为字符串是不可变的。只需从您想要收集的几个部分创建一个新的字符串。但是，如果您仍然需要一个能够原地修改Unicode数据的对象，您应该使用

• io.StringIO对象
• 数组模块

Let’s see what we discussed above −

返回一个包含缓冲区全部内容的字符串

Example

示例

In this example, we will return a string with the entire contents of the buffer. We have a text stream StringIO −

import io

myStr = "Hello, How are you?"
print("String = ",myStr)

# StringIO is a text stream using an in-memory text buffer
strIO = io.StringIO(myStr)

# The getvalue() returns a string containing the entire contents of the buffer
print(strIO.getvalue())

Output

String = Hello, How are you?
Hello, How are you?

现在，让我们改变流的位置，写入新内容并显示

Change the stream position and write new String

Example

示例

We will see another example and change the stream position using the seek() method. A new string will be written at the same position using the write() method −

import io
myStr = "Hello, How are you?"

# StringIO is a text stream using an in-memory text buffer
strIO = io.StringIO(myStr)

# The getvalue() returns a string containing the entire contents of the buffer
print("String = ",strIO.getvalue())

# Change the stream position using seek()
strIO.seek(7)

# Write at the same position
strIO.write("How's life?")

# Returning the final string
print("Final String = ",strIO.getvalue())

Output

String = Hello, How are you?
Final String = Hello, How's life??

Create an array and convert it to Unicode string

Example

示例

在这个例子中，使用array()创建一个数组，然后使用tounicode()方法将其转换为Unicode字符串 -

import array

# Create a String
myStr = "Hello, How are you?"

# Array
arr = array.array('u',myStr)
print(arr)

# Modifying the array
arr[0] = 'm'

# Displaying the array
print(arr)

# convert an array to a unicode string using tounicode
print(arr.tounicode())

Output

array('u', 'Hello, How are you?')
array('u', 'mello, How are you?')
mello, How are you?

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