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Reading a huge .csv file
I'm currently trying to read data from .csv files in Python 2.7 with up to 1 million rows, and 200 columns (files range from 100mb to 1.6gb). I can do this (very slowly) for the files with under 300,000 rows, but once I go above that I get memory errors. My code looks like this:
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builtins.TypeError: must be str, not bytes
I've converted my scripts from Python 2.7 to 3.2, and I have a bug.
2 Answers
2
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How can I open multiple files using “with open” in Python?
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As of Python 2.7 (or 3.1 respectively) you can write
with open('a', 'w') as a, open('b', 'w') as b:
do_something()
In earlier versions of Python, you can sometimes use
contextlib.nested() to nest context managers. This won't work...
Rename an environment with virtualenvwrapper
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if you do:
$ ack-grep -ai doors ~/.virtualenvs/django/bin
you'll notice that will have doors as location and not django, you'll to change each file with the new location.
solution:
after renamed the folder execute the command below.
$ sed -i "...
Add text to Existing PDF using Python
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Example for [Python 2.7]:
from pyPdf import PdfFileWriter, PdfFileReader
import StringIO
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter
packet = StringIO.StringIO()
# create a new PDF with Reportlab
can = canvas...
Can a variable number of arguments be passed to a function?
... Not sure how you got myfunc(abc=123, def=456) to work, but in mine (2.7), 'def' can't be passed in this function without getting a SyntaxError. I assume this is because def has meaning in python. Try myfunc(abc=123,fgh=567) instead. (Otherwise, great answer and thanks for it!)
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How can I check if an ip is in a network in Python?
... I think your solution has a serious bug: addressInNetwork('172.7.1.1', '172.3.0.0/16') -> True (I converted 'L' to '<L' in my 64bit os)
– Taha Jahangir
Feb 10 '12 at 5:01
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How to read/process command line arguments?
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This is now part of standard Python as of 2.7 and 3.2 :)
– jpswain
Sep 3 '10 at 2:08
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Is it acceptable and safe to run pip install under sudo?
... your case you want to do something like :
chown -R $USER /Library/Python/2.7/site-packages/
or more generally
chown -R $USER <path to your global pip packages>
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How does SIGINT relate to the other termination signals such as SIGTERM, SIGQUIT and SIGKILL?
... kernel. Adds some context to your answer.
– Daniel Näslund
Jun 7 '12 at 10:58
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