如何将for循环与列表项结合

Question

I have some names in a list, I want to combine the names with some sentences that I have in a text file.

this is my test.txt, it contains following:

This is line 1
This is line 2
This is line 3

This is my code to combine the text file and list item

name = ['anjana','ashish','dilip','gaurav','grishma','hira','ishika','manoj',
        'muna']
x=1


with open('test.txt', mode = 'r+', encoding="utf=8") as f:

 for y in name:
  for line in f:
      if line.rstrip():
          line_strip = line.strip()
          tag_strip = '<s> ' + line.strip() +' </s>'
          subject = str(name[0])
          tag_end = ' (' + subject +'_'+ str(x).zfill(2) +')'
          print (tag_strip +tag_end)


          x = x+1

with this I can get the desired result for only the first item in the list. it doesn't iterate thru all the items

<s> This is line 1 </s> (anjana_01)
<s> This is line 2 </s> (anjana_02)
<s> This is line 3 </s> (anjana_03)

what I am looking for is

<s> This is line 1 </s> (anjana_01)
<s> This is line 2 </s> (anjana_02)
<s> This is line 3 </s> (anjana_03)
.......... so on until
<s> This is line 1 </s> (muna_01)
<s> This is line 2 </s> (muna_02)
<s> This is line 3 </s> (muna_03)

Answer 1

After the file is opened you've iterated through it and for line in f doesn't give you any more elements.

Try putting with open('test.txt', mode = 'r+', encoding="utf=8") as f after for y in name

Better still, read your lines in once and add the names afterwards, to reduce the IO component of the program.

Answer 2

Try the following approach:

>>> txtdata = """This is line 1
... This is line 2
... This is line 3"""
>>> 
>>> name = ['anjana','ashish','dilip','gaurav','grishma','hira','ishika','manoj','muna']
>>>
>>> result = []
>>> 
>>> for i in name:
...     for idx, data in enumerate(txtdata.splitlines(), 1):
...             result.append('<s> ' + data + ' </s>' + ' (' + i + '_0' + str(idx) + ')')
... 
>>> for i in result:
...     print(i)
... 
<s> This is line 1 </s> (anjana_01)
<s> This is line 2 </s> (anjana_02)
<s> This is line 3 </s> (anjana_03)
...
...
<s> This is line 1 </s> (muna_01)
<s> This is line 2 </s> (muna_02)
<s> This is line 3 </s> (muna_03)
>>> 

Answer 3

When you say for line in f you are consuming the data from the file handle. You should instead store the data, and iterate over it multiple times. You can say f.readlines() to get all the lines, then use them in your loop repeatedly.

Answer 4

There are several issues. You could go on with using seek() method to move cursor to the beginning of the file after each iteration. Secondly, you use only first element from the name list instead of using variable y . This has most necessary improvments:

name = ['anjana','ashish','dilip','gaurav','grishma','hira','ishika','manoj',
        'muna']
x=1


with open('test.txt', mode = 'r+') as f:

 for y in name:
  for line in f:
      if line.rstrip():
          line_strip = line.strip()
          tag_strip = '<s> ' + line.strip() +' </s>'
          subject = str(y)
          tag_end = ' (' + subject +'_'+ str(x).zfill(2) +')'
          print (tag_strip +tag_end)
  f.seek(0, 0)

Please, pay attention to proper line formatting. No one uses one space per indentation. Use 4 instead. And more descriptive names like

names = ['anjana', 'ashish', ...]
(...)
for name in names: