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Why does csv.DictReader skip empty lines?


Why does csv.DictReader skip empty lines?

By : Fiasco Logic
Date : November 21 2020, 01:01 AM
Hope this helps Inside the csv.DictReader class:
code :
    # unlike the basic reader, we prefer not to return blanks,
    # because we will typically wind up with a dict full of None
    # values
    while row == []:
        row = self.reader.next()
import csv
CSV_FIELDS = ("field1", "field2", "field3")

class MyDictReader(csv.DictReader):
    def next(self):
        if self.line_num == 0:
            # Used only for its side effect.
            self.fieldnames
        row = self.reader.next()
        self.line_num = self.reader.line_num

        d = dict(zip(self.fieldnames, row))
        lf = len(self.fieldnames)
        lr = len(row)
        if lf < lr:
            d[self.restkey] = row[lf:]
        elif lf > lr:
            for key in self.fieldnames[lr:]:
                d[key] = self.restval
        return d

for row in MyDictReader(open("f", 'rb'), fieldnames=CSV_FIELDS, restval=""):
    print(row)
{'field2': '2', 'field3': '3', 'field1': '1'}
{'field2': '', 'field3': '', 'field1': ''}
{'field2': '', 'field3': '', 'field1': ''}
{'field2': 'b', 'field3': 'c', 'field1': 'a'}


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How to skip pre header lines with csv.DictReader?

How to skip pre header lines with csv.DictReader?


By : user3586226
Date : March 29 2020, 07:55 AM
wish helps you I used islice from itertools. My header was in the last line of a big preamble. I have passed preamble and used hederline for fieldnames:
code :
with open(file, "r") as f:
    '''Pass preamble'''
    n = 0
    for line in f.readlines():
        n += 1
        if 'same_field_name' in line: # line with field names was found
            h = line.split(',')
            break
    f.close()
    f = islice(open(i, "r"), n, None)

    reader = csv.DictReader(f, fieldnames = h)
Python: skip comment lines marked with # in csv.DictReader

Python: skip comment lines marked with # in csv.DictReader


By : Alexis Cada
Date : March 29 2020, 07:55 AM
may help you . Processing CSV files with csv.DictReader is great - but I have CSV files with comment lines in (indicated by a hash at the start of a line), for example: , Actually this works nicely with filter:
code :
import csv
fp = open('samples.csv')
rdr = csv.DictReader(filter(lambda row: row[0]!='#', fp))
for row in rdr:
    print(row)
fp.close()
Skip comments lines of different types in csv.Dictreader

Skip comments lines of different types in csv.Dictreader


By : Sokonosako
Date : March 29 2020, 07:55 AM
I wish this help you What you should be able to do is skip all the preceding lines until something with a chr starts, such as:
code :
import csv
from itertools import dropwhile

with open('somefile') as fin:
    start = dropwhile(lambda L: not L.lower().lstrip().startswith('chr'), fin)
    for row in csv.DictReader(start, delimiter='\t'):
        # do something
Python - skip empty lines and print 3 lines after a match

Python - skip empty lines and print 3 lines after a match


By : reshmaa kumaran
Date : March 29 2020, 07:55 AM
should help you out You need to tell it to skip blank lines when printing (comments are inline):
code :
if " win" in line:
    for _ in range(3):  # do three times
        line = f.readline()  # get next line
        # skip blank lines
        while not line.strip():
            line = f.readline()
        # Print the non-blank line
        print(line, end="")
line = f.readline()
how to skip empty lines from a txt file with php

how to skip empty lines from a txt file with php


By : Samuel Peña
Date : March 29 2020, 07:55 AM
To fix this issue I am using this code to delete an email address form a txt file named database-email.txt: , You could try something like this :
code :
file_put_contents('database-email.txt',
    str_replace("\n\n", "\n", file_get_contents('database-email.txt'))
);
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