从python文件中读取特定字符串？

Question

I want to read the above file foo.txt and read only UDE from the first line and store it in a variable then Unspecified from the second line and store it in a variable and so on. should I use read or readlines ? should I use regex for this ?? My below program is reading the entire line. how to read the specific word in the line ?

fo = open("foo.txt", "r+")
line = fo.readline()
left, right = line.split(':')
result = right.strip()
File_Info_Domain = result
print File_Info_Domain
line = fo.readline()
left, right = line.split(':')
result = right.strip()
File_Info_Intention = result
print File_Info_Intention
line = fo.readline()
left, right = line.split(':')
result = right.strip()
File_Info_NLU_Result = result
print File_Info_NLU_Result
fo.close()

Answer 1

You can use readline() (without s in name) to read line on-by-one, and then you can use split(':') to get value from line.

fo = open("foo.txt", "r+")

# read first line
line = fo.readline()

# split line only on first ':'
elements = line.split(':', 1) 

if len(elements) < 2:
    print("there is no ':' or there is no value after ':' ")
else:
    # remove spaces and "\n"
    result = elements[1].strip()
    print(result)

#
# time for second line
#

# read second line
line = fo.readline()

# split line only on first ':'
elements = line.split(':', 1)

if len(elements) < 2:
    print("there is no ':' or there is no value after ':' ")
else:
    # remove spaces and "\n"
    result = elements[1].strip()
    print(result)

# close
fo.close()

Answer 2

While you can use @furas response or regex, I would recommend you to use a config file to do this, instead of a plain txt. So your config file would look like:

[settings]
Domain=UDE
Intention=Unspecified
nlu_slot_details={"Location": {"literal": "18 Slash 6/2015"}, "Search-phrase": {"literal": "18 slash 6/2015"}

And in your python code:

import configparser

config = configparser.RawConfigParser()
config.read("foo.cfg")

domain = config.get('settings', 'Domain')
intention = config.get('settings', 'Intention')
nlu_slot_details = config.get('settings', 'nlu_slot_details')