如何在Python中就地修改字串？

很不幸，您無法原地修改字串，因為字串是不可變的。只需從您想要收集的幾個部分創建一個新的字串。但是，如果您仍然需要一個能夠原地修改Unicode資料的對象，您應該使用

• io.StringIO物件
• 數組模組

Let’s see what we discussed above −

傳回一個包含緩衝區全部內容的字串

Example

的中文翻譯為：

範例

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?

現在，讓我們改變流的位置，寫入新內容並顯示

Change the stream position and write new String

Example

的中文翻譯為：

範例

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

的中文翻譯為：

範例

在這個範例中，使用array()建立一個數組，然後使用tounicode()方法將其轉換為Unicode字串 -

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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