I'm learning python. I want to do this:
I have a text file with a lot of lines like this (each line have 26 strings, some strings can be whitespaces or not, followed the number of line):
BBBTHTHTTTTCCCHHHHHH 1
CCCTTTTHHHHHHHHHHHTTTTTTTT 2
TTTTTTTTTTHHHHHHHHCCCCCC 3
CTCTTTTTTTTTTTTTTHHHHHHHHH 4
I want to read the string from 22 to 26 position, and if all these positions are H, then print the complete line. For example:
BBBTHTHTTTTCCCHHHHHH 1
CTCTTTTTTTTTTTTTTHHHHHHHHH 4
My script is this
f = open("file.txt", "r")
lines = [line for line in f.readlines() if line[22:26]=="H"]
print lines
anybody can help me to fix it? Thanks for your support and tips.
Try this:
with open('file.txt') as f:
for i in f:
if i[21:26]=='HHHHH':
print(i)
You can use split()
and endswith()
res = [line for line in f if line.split()[0].endswith('H' * (26 - 21))]
print(res)
Output:
[' BBBTHTHTTTTCCCHHHHHH 1', 'CTCTTTTTTTTTTTTTTHHHHHHHHH 4']
It can be :
with open('file.txt') as f:
lines = '\n'.join([l for l in f.read().splitlines() if l[22:26] == 'HHHH'])
print(lines)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.