jt11...@gmail.com wrote:
> On Friday, February 20, 2015 at 8:11:59 AM UTC-5, Peter Otten wrote:
>> Jay T wrote:
>>
>> > have some log file which has nested data which i want to filter and
>> > provide specific for student with total counts
>> >
>> > Here is my log file sample:
>> > Student name is ABC
>> > Student age is 12
>> > student was late
>> > student was late
>> > student was late
>> > Student name is DEF
>> > student age is 13
>> > student was late
>> > student was late
>> >
>> > i want to parse and show data as Student name, student age , number of
>> > counts how many times student was late e:g Name Age TotalCount
>> > ABC 12 3
>> > DEF 13 2
>> >
>> > Please help me with solution that will be really grateful.
>>
>> What have you tried? Please show us some code.
>>
>> The basic idea would be to iterate over the lines and split the current
>> line into words.
>>
>> If the second word is "name" and it's not the first iteration print the
>> student's name, age, and was_late count. Then set the name variable to
>> the new name and reset age and was_late to 0. To detect the first
>> iteration you can set
>>
>> name = None
>>
>> before you enter the loop and then check for that value before printing:
>>
>> if name is not None:
>> ... # print student data
>>
>> If the second word is "age" convert the 4th word to integer and set the
>> age variable.
>>
>> If the second word is "was" increment the was_late counter.
>>
>> Remember that when the loop ends and the file was not empty you have one
>> more student's data to print.
> Now get stuck to get count for total_late time as it is part of name, age
> so how to write logic which counts as a part of group.
>
> any help will be grateful.
Try to write code that does what I describe in my outline. Initialise name
before the loop and dump the collected data when you encounter a new name.
name = None
total_late = 0
age = "unknown"
with open("student.txt") as instream:
for line in instream:
words = line.split()
if words[1] == "name":
if name is not None:
print name, age, total_late
name = " ".join(words[3:])
age = "unknown"
total_late = 0
elif words[1] == "was":
total_late += 1
elif words[1] == "age":
age = int(words[3])
else:
print "don't know what to do with line %r" %line
if name is not None:
print name, age, total_late
Checking whole words has the advantage that there will be no match if the
string "name" or "age" is part of the student's name.
> I tried to implent below code and got stucked how to do nested loop to
> count instead doing another logic and parsing:
>
> import re
> def GetName(input_string):
> myName=input_string.split()
> myName1= myName[1]
That's the wrong index.
> return myName1
> def GetAge(input_string):
> myAge=input_string.split()
> myAge1= myAge[2]
That's the wrong index.
> return myAge1
In general you should test your functions independently from the whole
program. That way you can build on known-good components and thus reduce the
area where to look for remaining bugs.
> file = open('mylogfile')
> log_data = file.readlines()
The file is probably short enough that it doesn't matter here, but iterating
over the file directly is good habit to get into. Example:
with open("mylogfile") as log_data:
for eachline in log_data:
...
> print 'entered'
> for eachline in log_data:
> input_string = eachline
> if 'name' in input_string:
> sometextval = GetName(input_string)
> print "name", sometextval
> if 'Age' in input_string:
This test is problematic because Python takes case into account when
comparing strings:
>>> "age" == "AGE"
False
>>> s = "RAGE"
>>> "age" in s
False
If case isn't consistent you should convert the string to lowercase:
>>> "age" == "AGE".lower()
True
>>> "age" in s.lower()
True
> sometextval2 = GetAge(input_string)
> print "Age", sometextval2
>
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