如何 append 仅从给定起点将数据从文本文件到列表，而不是使用 python 附加完整文件

Question

I want to append data from text file to a list from a given starting point. The stating point string can be anywhere in the file. i want to append the data from that starting point. I tried by using startswith method:

list1=[] 
TextFile = "txtfile.txt"
# open the file for data processing
with open(TextFile,'rt',encoding="utf8") as IpFile:
    for i,j in enumerate(IpFile):
        if(j.startswith("Starting point")):
            list1.append(str(j).strip()) 
            i+=1      

but it only append the starting point. i want to append the all data from starting point. How to do that?

Answer 1

Use a boolean variable

list1=[] 
TextFile = "txtfile.txt"
doAppend = False
# open the file for data processing
with open(TextFile,'rt',encoding="utf8") as IpFile:
    for i,j in enumerate(IpFile):
        if(j.startswith("Starting point")):
            doAppend = True
        if doAppend:
            list1.append(str(j).strip()) 
            i+=1      

Answer 2

You could do it without a bool as well by break ing the for loop and then reading the rest of the file.

list1 = [] 
text_file = "txtfile.txt"
# rt is the default so theres no need to specify it
with open(text_file, encoding="utf8") as ip_file:
    for line in ip_file:
        if line.startswith("Starting point"):
            break
    # read the rest of the file
    remainder = ip_file.read()
    # extend the list with the rest of the file split on newlines
    list1.extend(remainder.split('\n'))