[Python-checkins] cpython: *sigh* - i don't like this workflow at all
skip.montanaro
python-checkins at python.org
Sat Mar 19 19:08:12 CET 2011
http://hg.python.org/cpython/rev/145c3703ce48
changeset: 68685:145c3703ce48
user: Skip Montanaro <skip at pobox.com>
date: Sat Mar 19 13:05:58 2011 -0500
summary:
*sigh* - i don't like this workflow at all
files:
Doc/library/csv.rst
diff --git a/Doc/library/csv.rst b/Doc/library/csv.rst
--- a/Doc/library/csv.rst
+++ b/Doc/library/csv.rst
@@ -418,101 +418,50 @@
The simplest example of reading a CSV file::
-<<<<<<< local
- import csv
- with f = open("some.csv", newline=''):
- reader = csv.reader(f)
- for row in reader:
- print(row)
-=======
import csv
with open('some.csv', newline='') as f:
reader = csv.reader(f)
for row in reader:
print(row)
->>>>>>> other
Reading a file with an alternate format::
-<<<<<<< local
- import csv
- with f = open("passwd"):
- reader = csv.reader(f, delimiter=':', quoting=csv.QUOTE_NONE)
- for row in reader:
- print(row)
-=======
import csv
with open('passwd') as f:
reader = csv.reader(f, delimiter=':', quoting=csv.QUOTE_NONE)
for row in reader:
print(row)
->>>>>>> other
The corresponding simplest possible writing example is::
-<<<<<<< local
- import csv
- with f = open("some.csv", "w"):
- writer = csv.writer(f)
- writer.writerows(someiterable)
-=======
import csv
with open('some.csv', 'w') as f:
writer = csv.writer(f)
writer.writerows(someiterable)
->>>>>>> other
Since :func:`open` is used to open a CSV file for reading, the file
will by default be decoded into unicode using the system default
encoding (see :func:`locale.getpreferredencoding`). To decode a file
using a different encoding, use the ``encoding`` argument of open::
-<<<<<<< local
- import csv
- f = open("some.csv", newline='', encoding='utf-8'):
- reader = csv.reader(f)
- for row in reader:
- print(row)
-=======
import csv
with open('some.csv', newline='', encoding='utf-8') as f:
reader = csv.reader(f)
for row in reader:
print(row)
->>>>>>> other
The same applies to writing in something other than the system default
encoding: specify the encoding argument when opening the output file.
Registering a new dialect::
-<<<<<<< local
- import csv
- csv.register_dialect('unixpwd', delimiter=':', quoting=csv.QUOTE_NONE)
- with f = open("passwd"):
- reader = csv.reader(f, 'unixpwd')
- for row in reader:
- pass
-=======
import csv
csv.register_dialect('unixpwd', delimiter=':', quoting=csv.QUOTE_NONE)
with open('passwd') as f:
reader = csv.reader(f, 'unixpwd')
->>>>>>> other
A slightly more advanced use of the reader --- catching and reporting errors::
-<<<<<<< local
- import csv, sys
- filename = "some.csv"
- with f = open(filename, newline=''):
- reader = csv.reader(f)
- try:
- for row in reader:
- print(row)
- except csv.Error as e:
- sys.exit('file {}, line {}: {}'.format(filename, reader.line_num, e))
-=======
import csv, sys
filename = 'some.csv'
with open(filename, newline='') as f:
@@ -522,7 +471,6 @@
print(row)
except csv.Error as e:
sys.exit('file {}, line {}: {}'.format(filename, reader.line_num, e))
->>>>>>> other
And while the module doesn't directly support parsing strings, it can easily be
done::
--
Repository URL: http://hg.python.org/cpython
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