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I have a large text file in Python. Firstly, I want to read the text then, delete lines which have only numbers. Then, I open a new text file and write with my changes.
If the line contains numbers and strings, I want to keep them. I tried with isdigit and regex but I couldn't...
e.g. I tried: but it deletes all lines that contain numbers.
if not all(line.isdigit() for line in text_data):
new question:
line1: 324 4234 23456
if I have a line which contains numbers and space only like line1, how I skip them to my new text file?
Strip whitespace from the line before checking if it is all numbers.
for line in text_data:
if line.strip().isdigit():
# do what is required for a line with all numbers
else:
# do what is required for an alphanumeric line
I think you just need to read the file, filter it if line is not a digit, then write it to a new file:
with open('old.txt') as old, open('new.txt', 'w') as new:
for line in filter(lambda text: not text.strip().isnumeric(), old): new.write(line)
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I have a .txt file with a variable called id=
How can I write a script that will look into that .txt file, find id= and insert a string right after the =?
I do have a separate .py file called dictionary that contains a dictionary with the purpose of finding and replacing certain words in the .txt file.
Could I also use this dictionary as a way to find and insert?
Read the file line by line, if line has 'id=' replace it with the builtin replace method of str and write the new line, else write the old line.
with open(path_to_file) as fp:
with open(path_to_new_file, 'w') as nfp:
string = "whatever"
for line in fp:
if "id=" in line:
new_line = line.replace("id=", f"id={string}")
print(f"replacing {line} with {new_line}")
nfp.write(new_line)
else:
nfp.write(line)
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I want read from file and store it as an array, for example :
test.txt :
1,2,7,2,3
5,8,1,6
7,4
7,4,4,4,4,4,4,4,4,0,5,4
Output:
{1,2,3,7}
{1,5,6,8}
{4,7}
{0,4,5,7}
How to fetch it as an array?
From what I understand, you want to parse your file in order to output the sets of numbers for each line, isn't it ?
If it is, a solution could be:
with open("test.txt") as f:
content = f.read()
l = [set(int(x) for x in l.split(','))
for l in content.splitlines()]
print (l)
This piece of code does not sort the set though, to do this, you will have to use frozenset as well as the sorted built-in function.
This should work.
Read from file
Split using newline character
Replace , in set
Like this
with open("test.txt",'r') as text_file: #reading in read mode
#to get the list of lines replacing new line
lines=text_file.read().split('\n')
#replace commas and make a set
set_of_lines = [ set(line.replace(",","")) for line in lines]
for line in set_of_lines:
print(line)
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I am getting into file handling in python and want to read the info in a file. How do I read the file without additional lines?
Here's my code:
data = f.readlines()
for line in data:
print(line)
Incorporating falsetru's point,
for line in f:
if line.strip():
print(line)
The strip command will strip all white space, and at that point, if you have an empty string, the condition will fail.
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I am trying to make a function that takes typically copy-pasted text that very often includes \n characters. An example of such is as follows:
func('''This
is
some
text
that I entered''')
The problem with this function is the text can sometimes be rather large, so taking it line by line to avoid ', " or ''' isn't plausible. A piece of text that can cause issues is as follows:
func('''This
is'''
some"
text'
that I entered''')
I wanted to know if there is any way I can take the text as seen in the second example and use it as a string regardless of what it is comprised of.
Thanks!
To my knowledge, you won't be able to paste the text directly into your file. However, you could paste it into a text file.
Use regex to find triple quotes ''' and other invalid characters.
Example python:
def read_paste(file):
import re
with open(file,'r') as f:
data = f.readlines()
for i,line in enumerate(data):
data[i] = re.sub('("|\')',r'\\\1',line)
output = str()
for line in data:
output += line
return output
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I use the following code segment to read a file in python
file = open("test.txt", "rb")
data=file.readlines()[1:]
file.close
print data
However, I need to read the entire file (apart from the first line) as a string into the variable data.
As it is, when my files contents are test test test, my variable contains the list ['testtesttest'].
How do I read the file into a string?
I am using python 2.7 on Windows 7.
The solution is pretty simple. You just need to use a with ... as construct like this, read from lines 2 onward, and then join the returned list into a string. In this particular instance, I'm using "" as a join delimiter, but you can use whatever you like.
with open("/path/to/myfile.txt", "rb") as myfile:
data_to_read = "".join(myfile.readlines()[1:])
...
The advantage of using a with ... as construct is that the file is explicitly closed, and you don't need to call myfile.close().