I'm working on a text extraction with python. The output is not as desirable as I want it!
I have a text file containing information like this:
FN Clarivate Analytics Web of Science
VR 1.0
PT J
AU Chen, G
Gully, SM
Whiteman, JA
Kilcullen, RN
AF Chen, G
Gully, SM
Whiteman, JA
Kilcullen, RN
TI Examination of relationships among trait-like individual differences,
state-like individual differences, and learning performance
SO JOURNAL OF APPLIED PSYCHOLOGY
CT 13th Annual Conference of the
Society-for-Industrial-and-Organizational-Psychology
CY APR 24-26, 1998
CL DALLAS, TEXAS
SP Soc Ind & Org Psychol
RI Gully, Stanley/D-1302-2012
OI Gully, Stanley/0000-0003-4037-3883
SN 0021-9010
PD DEC
PY 2000
VL 85
IS 6
BP 835
EP 847
DI 10.1037//0021-9010.85.6.835
UT WOS:000165745400001
PM 11125649
ER
and when I use my code like this
import random
import sys
filepath = "data\jap_2000-2001-plain.txt"
with open(filepath) as f:
articles = f.read().strip().split("\n")
articles_list = []
author = ""
title = ""
year = ""
doi = ""
for article in articles:
if "AU" in article:
author = article.split("#")[-1]
if "TI" in article:
title = article.split("#")[-1]
if "PY" in article:
year = article.split("#")[-1]
if "DI" in article:
doi = article.split("#")[-1]
if article == "ER#":
articles_list.append("{}, {}, {}, https://doi.org/{}".format(author, title, year, doi))
print("Oh hello sir, how many articles do you like to get?")
amount = input()
random_articles = random.sample(articles_list, k = int(amount))
for i in random_articles:
print(i)
print("\n")
exit = input('Please enter exit to exit: \n')
if exit in ['exit','Exit']:
print("Goodbye sir!")
sys.exit()
The extraction does not include data that has been entered after the linebreak, If I run this code, output would look like "AU Chen, G" and does not include the other names, same with the Title etc etc.
My output looks like:
Chen, G. Examination of relationships among trait, 2000, doi.dx.10.1037//0021-9010.85.6.835
The desired output should be:
Chen, G., Gully, SM., Whiteman, JA., Kilcullen, RN., 2000, Examination of relationships among trait-like individual differences, state-like individual differences, and learning performance, doi.dx.10.1037//0021-9010.85.6.835
but the extraction only includes the first row of each line –
Any suggestions?
You need to track what section you are in as you are parsing the file. There are cleaner ways to write the state machine, but as a quick and simple example, you could do something like below.
Basically, add all the lines for each section to a list for that section, then combine the lists and do whatever at the end. Note, I didn't test this, just psuedo-coding to show you the general idea.
authors = []
title = []
section = None
for line in articles:
line = line.strip()
# Check for start of new section, select the right list to add to
if line.startswith("AU"):
line = line[3:]
section = authors
elif line.startswith("TI"):
line = line[3:]
section = title
# Other sections..
...
# Add line to the current section
if line and section is not None:
section.append(line)
authors_str = ', '.join(authors)
title_str = ' '.join(title)
print authors_str, title_str
Initial Understanding
Based on your example, I believe that:
ER
marks the end-of-record .ER
section contains no usable text. It may also be the case that:
FN
tag.FN / ER
pair can be ignored.Suggested Design
If this is true, I recommend you write a text processor using that logic:
ER
.ER
state until a FN
line is encountered.ER
state is entered, add the accumulated record to the list of accumulated records.At the end of this process, you will have a list of records, having various accumulated tags. You may then process the tags in various ways.
Something like this:
from warnings import warn
Debug = True
def read_lines_from(file):
"""Read and split lines from file. This is a separate function, instead
of just using file.readlines(), in case extra work is needed like
dos-to-unix conversion inside a unix environment.
"""
with open(file) as f:
text = f.read()
lines = text.split('\n')
return lines
def parse_file(file):
"""Parse file in format given by
https://stackoverflow.com/questions/54520331
"""
lines = read_lines_from(file)
state = 'ER'
records = []
current = None
for line_no, line in enumerate(lines):
tag, rest = line[:2], line[3:]
if Debug:
print(F"State: {state}, Tag: {tag}, Rest: {rest}")
# Skip empty lines
if tag == '':
if Debug:
print(F"Skip empty line at {line_no}")
continue
if tag == ' ':
# Append text, except in ER state.
if state != 'ER':
if Debug:
print(F"Append text to {state}: {rest}")
current[state].append(rest)
continue
# Found a tag. Process it.
if tag == 'ER':
if Debug:
print("Tag 'ER'. Completed record:")
print(current)
records.append(current)
current = None
state = tag
continue
if tag == 'FN':
if state != 'ER':
warn(F"Found 'FN' tag without previous 'ER' at line {line_no}")
if len(current.keys()):
warn(F"Previous record (FN:{current['FN']}) discarded.")
if Debug:
print("Tag 'FN'. Create empty record.")
current = {}
# All tags except ER get this:
if Debug:
print(F"Tag '{tag}'. Create list with rest: {rest}")
current[tag] = [rest]
state = tag
return records
if __name__ == '__main__':
records = parse_file('input.txt')
print('Records =', records)
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