Re: [Tutor] how to expand "../../myfile"
On 2014-07-18 23:44, Alan Gauld wrote: On 19/07/14 02:33, Alex Kleider wrote: Just to be able to glean the current working directory would suffice. os.getcwd() solutions are tumbling from the sky! Thank you, Alan. alex ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Read, Write, Split and Append lines from a text file
I have given it all I got: a week trying to open, read, write, split, append,
convert to integers and then manipulate the data. I have attached the file I
want to pull the names and numbers from. I'll cut and paste it incase that
doesn't work and then include a sample of the python shell code.
AK 36
AL 39
AR 39
AZ 45
CA 61
CO 54
CT 61
DC 93
DE 62
FL 51
GA 47
HI 72
IA 54
ID 36
IL 62
IN 50
KS 41
KY 41
LA 40
MA 62
MD 62
ME 58
MI 57
MN 54
MO 49
MS 43
MT 47
NC 50
ND 45
NE 41
NH 54
NJ 57
NM 57
NV 55
NY 62
OH 51
OK 34
OR 57
PA 55
RI 63
SC 45
SD 45
TN 42
TX 44
UT 34
VA 53
VT 67
WA 58
WI 56
WV 43
WY 33
# and now my newbie attempt:
# I can get this far in approach #1
>>> filename = "z:/Geog482/egund919/Program1/BOJ.txt"
>>> myfile = open(filename,"r")
>>> newfile = "z:/Geog482/egund919/Program1/BOJ_B.txt"
>>> mynewfile = open(newfile,"w")
>>> while True:
line = myfile.readline()
print line
mynewfile.write(line)
if not line: break
States OJ
AK 36
AL 39
AR 39
AZ 45
CA 61
CO 54
CT 61
DC 93
DE 62
FL 51
GA 47
HI 72
IA 54
ID 36
IL 62
IN 50
KS 41
KY 41
LA 40
MA 62
MD 62
ME 58
MI 57
MN 54
MO 49
MS 43
MT 47
NC 50
ND 45
NE 41
NH 54
NJ 57
NM 57
NV 55
NY 62
OH 51
OK 34
OR 57
PA 55
RI 63
SC 45
SD 45
TN 42
TX 44
UT 34
VA 53
VT 67
WA 58
WI 56
WV 43
WY 33
In approach number 2: trying to append, convert to integer, but the list comes
up empty:
>>> infile = open('C:/Python27/egund919/Program1/BOJ_B.txt','r')
>>> import string
>>> state_name = []
>>> data_value = []
>>> counter = 0
>>> x = 0
>>> line = infile.readline()
>>> while True:
line = infile.readline()
if not line: break
counter = counter + 1
States, OJ = string.split(line)
XSTATES = str(States)
XNUM = int(OJ)
state_name.append(XSTATES)
data_value.append(XNUM)
>>> type(data_value)
>>> print(data_value)
[]
>>> print (line)
All I get is errors from here on out.
LN
States OJ
AK 36
AL 39
AR 39
AZ 45
CA 61
CO 54
CT 61
DC 93
DE 62
FL 51
GA 47
HI 72
IA 54
ID 36
IL 62
IN 50
KS 41
KY 41
LA 40
MA 62
MD 62
ME 58
MI 57
MN 54
MO 49
MS 43
MT 47
NC 50
ND 45
NE 41
NH 54
NJ 57
NM 57
NV 55
NY 62
OH 51
OK 34
OR 57
PA 55
RI 63
SC 45
SD 45
TN 42
TX 44
UT 34
VA 53
VT 67
WA 58
WI 56
WV 43
WY 33
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Re: [Tutor] Read, Write, Split and Append lines from a text file
Please include the complete stack
trace error message
It will help in determining what the error is.
Jay
On 07/19/2014 05:27 PM, LN A-go-go
wrote:
I have given it all I got: a week trying to open, read,
write, split, append, convert to integers and then manipulate
the data. I have attached the file I want to pull the names
and numbers from. I'll cut and paste it incase that doesn't
work and then include a sample of the python shell code.
AK 36
AL 39
AR 39
AZ 45
CA 61
CO 54
CT 61
DC 93
DE 62
FL 51
GA 47
HI 72
IA 54
ID 36
IL 62
IN 50
KS 41
KY 41
LA 40
MA 62
MD 62
ME 58
MI 57
MN 54
MO 49
MS 43
MT 47
NC 50
ND 45
NE 41
NH 54
NJ 57
NM 57
NV 55
NY 62
OH 51
OK 34
OR 57
PA 55
RI 63
SC 45
SD 45
TN 42
TX 44
UT 34
VA 53
VT 67
WA 58
WI 56
WV 43
WY 33
# and now my newbie attempt:
# I can get this far in approach #1
>>> filename =
"z:/Geog482/egund919/Program1/BOJ.txt"
>>> myfile = open(filename,"r")
>>> newfile =
"z:/Geog482/egund919/Program1/BOJ_B.txt"
>>> mynewfile = open(newfile,"w")
>>> while True:
line = myfile.readline()
print line
mynewfile.write(line)
if not line: break
States OJ
AK 36
AL 39
AR 39
AZ 45
CA 61
CO 54
CT 61
DC 93
DE 62
FL 51
GA 47
HI 72
IA 54
ID 36
IL 62
IN 50
KS 41
KY 41
LA 40
MA 62
MD 62
ME 58
MI 57
MN 54
MO 49
MS 43
MT 47
NC 50
ND 45
NE 41
NH 54
NJ 57
NM 57
NV 55
NY 62
OH 51
OK 34
OR 57
PA 55
RI 63
SC 45
SD 45
TN 42
TX 44
UT 34
VA 53
VT 67
WA 58
WI 56
WV 43
WY 33
In approach number 2: trying to append, convert
to integer, but the list comes up empty:
>>> infile =
open('C:/Python27/egund919/Program1/BOJ_B.txt','r')
>>> import string
>>> state_name = []
>>> data_value = []
>>> counter = 0
>>> x = 0
>>> line = infile.readline()
>>> while True:
line = infile.readline()
if not line: break
counter = counter + 1
States, OJ = string.split(line)
XSTATES = str(States)
XNUM = int(OJ)
state_name.append(XSTATES)
data_value.append(XNUM)
>>> type(data_value)
>>> print(data_value)
[]
>>> print (line)
All I get is errors from here on out.
LN
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--
Jay Lozier
jsloz...@gmail.com
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Re: [Tutor] Read, Write, Split and Append lines from a text file
On 20/07/2014 00:59, Jay Lozier wrote: Please include the complete stack trace error message It will help in determining what the error is. Jay -- Jay Lozier jsloz...@gmail.com Please don't top post here. Did you have to include the entire message just to include a two sentence reply? -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Read, Write, Split and Append lines from a text file
On Sat, Jul 19, 2014 at 2:27 PM, LN A-go-go
wrote:
>
>
> I have given it all I got: a week trying to open, read, write, split, append,
> convert to integers and then manipulate the data. I have attached the file I
> want to pull the names and numbers from. I'll cut and paste it incase that
> doesn't work and then include a sample of the python shell code.
>
[cut]
Sounds good so far.
> # and now my newbie attempt:
> # I can get this far in approach #1
> >>> filename = "z:/Geog482/egund919/Program1/BOJ.txt"
> >>> myfile = open(filename,"r")
> >>> newfile = "z:/Geog482/egund919/Program1/BOJ_B.txt"
> >>> mynewfile = open(newfile,"w")
> >>> while True:
> line = myfile.readline()
> print line
> mynewfile.write(line)
> if not line: break
After you have written all these lines to 'newfile', did you call
close() on "newfile"? I was expecting:
mynewfile.close()
at the end of this block; the fact that it's missing looks unusual to me.
It may matter. File buffering may prevent another read of the file
from seeing the output you've written until the file has been
committed to disk.
> In approach number 2: trying to append, convert to integer, but the list
> comes up empty:
Given the logic of the block, there are a few ways that the data_value
may be empty. Let's take a look at it again.
infile = open('C:/Python27/egund919/Program1/BOJ_B.txt','r')
# ...
data_value = []
# ...
while True:
line = infile.readline()
if not line: break
# some content cut
data_value.append(...)
I've omitted all but what I think is essential for analyzing this
problem. I believe that the only way that data_value can be empty,
given the control flow of this program, if is the infile.readline()
returns a false value. The suggestion above about making sure the
file has been committed to disk is meant to address this possibility.
By the way, the looping over the file, using readline(), is
stylistically unusual. Files are "iterable": they can be used in for
loops directly. That is, the block:
infile = open('C:/Python27/egund919/Program1/BOJ_B.txt','r')
while True:
line = infile.readline()
...
can be written as:
infile = open('C:/Python27/egund919/Program1/BOJ_B.txt','r')
for line in infile:
...
and in general, this is preferable to the explicit readline() approach
you're using to iterate over the lines of a file.
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Re: [Tutor] Read, Write, Split and Append lines from a text file
LN A-go-go Wrote in message: By trying to include an attachment, you make it impossible for me to quote your actual message. Please use plain text message without attachments, to maximize the number of people that can read and readily respond. > StatesOJ > AK36 > AL39 > AR39 > AZ45 5 lines should be enough to get the idea. You don't specify the environment, so I'll have to assume Python 3.x. And it is likely Windows since you use x: as though it were part of the path. > You'll have to pretend this is properly quoted. ¥ and now my newbie attempt: # I can get this far in approach #1 >>> filename = "z:/Geog482/egund919/Program1/BOJ.txt" >>> myfile = open(filename,"r") >>> newfile = "z:/Geog482/egund919/Program1/BOJ_B.txt" >>> mynewfile = open(newfile,"w") >>> while True: line = myfile.readline() print line mynewfile.write(line) if not line: break ₩₩₩ print by itself is a no-op. If you had included the parentheses, it'd at least produce a blank line. line by itself is also a no-op. What were you trying to do with the variable? You neglected to close either of the files. Won't probably matter here, but it will someday. Best get the habit now. Just what was the point of this fragment? In what way did it fall short, other than having two no-ops in it? You have a different fragment with other apparent problems. But you never spell out the problem. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
