在Python中将字符串解析为不同格式

我有一个文本文档，需要在数组中的关键字之前添加两个@符号

示例文本和数组：

str ="This is a sample text document which consists of all demographic information of employee here is the value you may need,name: George employee_id:14296blood_group:b positive this is the blood group of the employeeage:32"

arr=['name','employee_id','blood_group','age']

str ="This is a sample text document which consists of all demographic information of employee here is the value you may need, @@name: George @@employee_id:14296 @@blood_group:b positive this is the blood group of the employee @@age:32"

所需文本：

str ="This is a sample text document which consists of all demographic information of employee here is the value you may need,name: George employee_id:14296blood_group:b positive this is the blood group of the employeeage:32"

arr=['name','employee_id','blood_group','age']

str ="This is a sample text document which consists of all demographic information of employee here is the value you may need, @@name: George @@employee_id:14296 @@blood_group:b positive this is the blood group of the employee @@age:32"

---

只需使用

replace

功能即可

str ="This is a sample text document which consists of all demographic information of employee here is the value you may need,name: George employee_id:14296blood_group:b positive this is the blood group of the employeeage:32"
arr = ['name','employee_id','blood_group','age']

for w in arr:
    str = str.replace(w, f'@@{w}')
print(str)

---

您只需在arr上循环并使用str.replace函数：

for repl in arr:
    strng.replace(repl, '@@'+repl)
    
print(strng)

---

但是，我建议您更改变量名

str

，因为它是一个保留关键字。

您可以替换该值，并在替换的值之前添加空格和double@@并在结果中将双空格替换为一个空格

str ="This is a sample text document which consists of all demographic information of employee here is the value you may need,name: George employee_id:14296blood_group:b positive this is the blood group of the employeeage:32"
arr=['name','employee_id','blood_group','age']

for i in arr:
    str = str.replace(i, " @@{}".format(i))
print(str.replace("  ", " "))

输出

This is a sample text document which consists of all demographic information of employee here is the value you may need, @@name: George  @@employee_id:14296 @@blood_group:b positive this is the blood group of the employee @@age:32

---

您可以按照以下方式使用

re

模块执行该任务

import re
txt = "This is a sample text document which consists of all demographic information of employee here is the value you may need,name: George employee_id:14296blood_group:b positive this is the blood group of the employeeage:32"
arr=['name','employee_id','blood_group','age']
newtxt = re.sub('('+'|'.join(arr)+')',r'@@\1',txt)
print(newtxt)

输出：

This is a sample text document which consists of all demographic information of employee here is the value you may need,@@name: George @@employee_id:14296@@blood_group:b positive this is the blood group of the employee@@age:32

---

说明：在这里，我使用正则表达式从列表中捕获单词，并将每个单词替换为@@word。这是单次传递，而不是使用多个str.replace时的X次传递（其中X是

arr

），因此在

arr

较长的情况下应该更有效。

作为替代方法，您可以在循环中转换以下内容以获得更长的列表。在@之前似乎也有空间

str=str[：str.find（arr[0]）]+'@'+str[str.find（arr[0]）：]

str=str[：str.find（arr[1]）]+'@'+str[str.find（arr[1]）：]

str=str[：str.find（arr[2]）]+'@'+str[str.find（arr[2]）：]

str=str[：str.find（arr[3]）]+'@'+str[str.find（arr[3]）：]