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I have a csv file deliminated by
The first line contains the report name, the second line contains the report data.
The headers are in line 3 and all the other rows are data.
How do I use the csv module to read the headers from line 3 instead of 1?
Below is what I have now.
import csv f = open ("myfile.csv", "rb") reader = csv.reader(f, delimiter=",") headers = reader.next()
You can use
itertools.islice to discard items from an iterator.
from itertools import islice reader = islice(csv.reader(f, delimiter=","), 2, None)
Python, How do I skip the first row in Python CSV? python csv headers not in first line. I have a csv file deliminated by ,. The first line contains the report name, the second line contains the report data. The headers are in line 3 and all the other rows are data.
If your file is not very large, you can just read everything and discard the first two lines later:
with file("myfile.csv", "rb") as f: reader = csv.reader(f, delimiter=',') lines = list(reader)[2:] headers, value_rows = lines, lines[1:] for row in value_rows: ...
How to read one single line of csv data in Python?, How do I read the first row of a CSV file in Python? We want to read all the rows of this csv file line by line and process each line at a time. Also note that, here we don’t want to read all lines into a list of lists and then iterate over it, because that will not be an efficient solution for large csv file i.e. file with size in GBs.
Maybe you could iterate until you get the desired line:
import csv headerLine = 3 f = open ("myfile.csv", "rb") reader = csv.reader(f, delimiter=",") for ii in range(0, headerLine): headers = reader.next()
How to read the first and last line of a file in Python, in the nrows parameter. Just drop your string data into a singleton list. In Python, while reading a CSV using the CSV module you can skip the first line using next() method. We usually want to skip the first line when the file is containing a header row, and we don’t want to print or import that row. The following is an example. Suppose you have a CSV file containing the following data with a header line.
python csv headers not in first line, How do I read a csv file without header in Python? I wanted to know: which credit card was better based on my purchase history? Like any normal person, I exported my transactions as CSV and began to dig around with Python. My CSV file had a header on the first line, which was different from the rest. The file looked something like this (not my actual transactions):
Skip the header of a file with Python's CSV reader › Evan Hahn (dot , How do you skip the first line of a file in Python? @Anto: The code in my answer is based on the "example for Sniffer use" in the documentation, so I assume it's the prescribed way to do it.I agree that doing it on the basis of one line of data doesn't seem like it would always be enough data to make such a determination—but I have no idea since how the Sniffer works isn't described.
Python: Read a CSV file line by line with or without header , I have a csv file deliminated by , . The first line contains the report name, the second line contains the report data. The headers are in line 3 and all the other rows Python has another method for reading csv files – DictReader. As the name suggest, the result will be read as a dictionary, using the header row as keys and other rows as a values. For example this: import csv with open ("actors.csv") as f: reader = csv.DictReader (f) data = [r for r in reader] Will result in a data dict looking as follows:
- @falsetru is right. The
csvmodule doesn't check that all rows are the same, so you can just call
next()to consume them and throw them away.
- Actually, if you want the data from the extra lines, you can just read it in a line at time (and save it, if desired) and then create the
csv.readerobject. The current position of the file doesn't have to at its very beginning when you do this.