File compare

[PyPK]

I have two files
file1 in format
<id> <val1> <test1> <test2>
'AA' 1 T T
'AB' 1 T F

file2 same as file1
<id> <val1> <test1> <test2>
'AA' 1 T T
'AB' 1 T T

Also the compare should be based on id. So it should look for line
starting with id 'AA' (for example) and then match the line so if in
second case.

so this is what I am looking for:
1. read both files.
2. read id of first line in file1 check if it matches with the same id
in file2.
3. repeat step 2 for all lines in file1.
4. return a percent of success to failure. ie if one line matches and
one lines does'nt then return 0.5 or 50%

I wrote a boolean version ..as a start

def getdata(f):
try:
f1 = open(f,'r')
data=[]
for eachline in f1.readlines():
data.append(re.split("",
re.sub('\n','',strip(re.split('\s\s+',eachline)[0]))))
return data
except IOError:
raise("Invalid File Input")

if __name__=='__main__':

data1 = getdata('file1')
data2 = getdata('file2')

if data1 == data2:
print "True"
else:
print "False"

hope I am clear...

 

[PyPK]

Note that the code i wrote wont do the compare based on id which i am
looking for..it just does a direct file to file compare..

 

[Larry Bates]

Sounds a little like "homework", but I'll help you out.
There are lots of ways, but this works.

import sys
class fobject:
def __init__(self, inputfilename):
try:
fp=open(inputfilename, 'r')
self.lines=fp.readlines()
except IOError:
print "Unable to open and read inputfilename=%s" % inputfilename
sys.exit(3)

self.datadict={}
for line in self.lines:
line=line.strip()
line=line.strip("'")
key, values=line.split(' ',1)
self.datadict[key]=values

return

def keys(self):
return self.datadict.keys()

def compare(self, otherobject):
keys=otherobject.keys()
match=0
for key in keys:
if self.datadict[key] == otherobject.datadict[key]: match+=1

return float(match)/float(len(keys))

if __name__=="__main__":
f1=fobject(r'f:\syscon\python\zbkup\f1.txt')
f2=fobject(r'f:\syscon\python\zbkup\f2.txt')
print f1.compare(f2)


Larry Bates

 

[PyPK]

Not for homework. But anyway thanks much...

 

[Magnus Lycka]

I have two files
file1 in format
<id> <val1> <test1> <test2>
'AA' 1 T T
'AB' 1 T F

file2 same as file1
<id> <val1> <test1> <test2>
'AA' 1 T T
'AB' 1 T T

Also the compare should be based on id. So it should look for line
starting with id 'AA' (for example) and then match the line so if in
second case.

See the recent thread with subject line "List performance and CSV".

 

[PyPK]

but what if
case 1:
no.of keys in f1 > f2 and
case2:
no.of keys in f1 < f2.
Should'nt we get 1.1 if case 1 and 0.9 if case 2?? it errors of with a
keyerror.?