将表格保存在 .txt 文件中

Question

I was wondering if you could help me with a rather simple bit of code that I got stuck on.

I have a table in .txt that looked like this:

FileName	predOGT (C)
CTOTU-1_1.fasta	31.30
CTOTU-2_1.fasta	21.39
CTOTU-0_1.fasta	11.31
CTOTU-2_5.fasta	42.32
CTOTU-2_2.fasta	34.33
CTOTU-1_2.fasta	35.34
CTOTU-0_3.fasta	23.35
CTOTU-1_3.fasta	64.36
CTOTU-2_4.fasta	33.37
CTOTU-2_3.fasta	27.38

Which I have successfully changed to look like this:

OldFile	NewFile	predOGT_(C)
CTOTU-1	1	31.30
CTOTU-2	1	21.39
CTOTU-0	1	11.31
CTOTU-2	5	42.32
CTOTU-2	2	34.33
CTOTU-1	2	35.34
CTOTU-0	3	23.35
CTOTU-1	3	64.36
CTOTU-2	4	33.37
CTOTU-2	3	27.38

Now I would like to save this new table to a new .txt table

Below is my code which so far allows only the last row to be saved in the new_file.txt .

Could you tell me what mistake I am doing?

filepath = 'original_file.txt'
new_filepath = 'new_file.txt'

with open(filepath, 'r+') as f:
    for line in f:
        new_line = line.strip()
        new_line = new_line.replace('_','\t').replace('FileName','OldFile\tNewFile').replace('predOGT (C)','predOGT_(C)').replace('.fasta','').replace('CTOTU-','')
        print(new_line)
        with  open(new_filepath, "w") as n:
            new = n.writelines(new_line)

Answer 1

By doing that

filepath = 'original_file.txt'
new_filepath = 'new_file.txt'

with open(filepath, 'r+') as f:
    for line in f:
        new_line = line.strip()
        new_line = new_line.replace('_','\t').replace('FileName','OldFile\tNewFile').replace('predOGT (C)','predOGT_(C)').replace('.fasta','').replace('CTOTU-','')
        print(new_line)
        with  open(new_filepath, "w") as n:
            new = n.writelines(new_line)

you are opening new_filepath for each for -loop turn in write ( w ) mode, which does remove existing content from it. If you want to added further data to existing file without erasing you need to use append ( a ) mode. Please run following snippets and observe what would happend in each case, first using w mode

with open("file1.txt","w") as f:
    f.write("uno\n")
with open("file1.txt","w") as f:
    f.write("dos\n")
with open("file1.txt","w") as f:
    f.write("tres\n")

then using a mode

with open("file2.txt","a") as f:
    f.write("uno\n")
with open("file2.txt","a") as f:
    f.write("does\n")
with open("file2.txt","a") as f:
    f.write("tres\n")

Answer 2

For me it worked like this:

n = open(new_filepath, "w")

with open(filepath, 'r+') as f:
    for line in f:
        print(new_line)
        n.writelines(new_line)

The new_filepath is opened before and then the indentation should be the same as the print() one to add every line that the loop goes through.