Regarding searching of strings

[bkunjitam]

i am a beginner in Python. I have a query.

I have a .txt file which has entries in the following manner:

Name: John
Age: 21

Name: Paul
Age:23

I need to search for the string "Name" and display all the values corresponding to the string that i am searching for. In this case the result should be John and Paul.
I am a bit confused with the re.search() function.

Kindly guide me regarding the same.

Regards,
BK

[fuffens]

If names always start with Name: in your file and is separated by a white space then this should do it

file = open('name.txt', 'r')
for line in file:
    if line.startswith('Name:'):
        name = line.split()[1]
        print name
file.close()

Use regular expressions for more compex search operations. Here you only need to find Name: so you can use normal string operations like startswith() or find().

Best regards
/Fredrik

[bvdet]

i am a beginner in Python. I have a query.

I have a .txt file which has entries in the following manner:

Name: John
Age: 21

Name: Paul
Age:23

I need to search for the string "Name" and display all the values corresponding to the string that i am searching for. In this case the result should be John and Paul.
I am a bit confused with the re.search() function.

Kindly guide me regarding the same.

Regards,
BK

I wrote a script to run in SDS/2 (software for structural steel detailing) that does something similar. The input file format is:

Origin:0.0,0.0
Direction:-90.0
41-5
42-8
......additiona l offset dimensions

Origin:0.0,0.0
Direction:0.0
1-11 1/2
1-0 1/2
.......addition al offset dimensions

The object of this script is to layout building grid lines in a plan view of the 3D model. Here's the code:

def run_script():
    try:
        from param import ResponseNotOK, Units, Dialog, Warning, dim
        from macrolib.ExceptWarn import formatExceptionInfo
        from macrolib.PolarPt import polar_pt_plan
        from point import Point
        from job import JobName
        from cons_line import ConsLine
        import os
        import string
        Units("feet")
 
        #####################################    
        def gridAdd(pt, dir, cons_color="Cyan"):
            # construction line begin
            cl2 = ConsLine()
            cl2.pt1 = pt
            cl2.angle = dir
            cl2.pen = cons_color
            cl2.add()
            # construction line end
        ####################################
 
        ## Dialog Box ######################
        dlg1 = Dialog("Building Grid Lines in Plan")
        dlg1.group_title("Import Grid Line File")
        dlg1.file('import_file', os.path.join(os.getcwd(), "jobs", JobName(), "macro", "TownCtrGrids.txt"), "Enter file name or browse       ")
        dlg1.menu('cons_color', ("Blue", "Green", "Yellow", "Magenta", "Red", "White", "Cyan"), "Blue", "Construction line color")
 
        try:
            dlg1.done()
        except ResponseNotOK:
            raise
 
        # Import grid line file
        try:
            f = open(dlg1.import_file, "r")
        except IOError, e:
            # unable to open file
            Warning("Unable to open file: %s" % (e))
 
        for item in f:
            if "origin" in string.lower(item):
                ptx, pty = item.split(':')[1].split(",")                    
                gridWP = Point(dim(ptx.strip()), dim(pty.strip()), 0.0)
            elif "direction" in string.lower(item):
                gridOffset = 0.0
                gridDir = dim(item.split(':')[1].strip())
                gridAdd(gridWP, gridDir, dlg1.cons_color)
            else:
                if dim(item.strip()):
                    gridOffset = gridOffset + dim(item.strip())
                    gridAdd(polar_pt_plan(gridWP, gridOffset, gridDir + 90.0), gridDir, dlg1.cons_color)
        f.close()
    except:
        Warning(formatExceptionInfo())
## END run_script() #########################
if __name__ == '__main__':
    try:
        run_script()
    finally:
        del run_script

Thanks to this list for the pointers received!

[bkunjitam]

If names always start with Name: in your file and is separated by a white space then this should do it

file = open('name.txt', 'r')
for line in file:
    if line.startswith('Name:'):
        name = line.split()[1]
        print name
file.close()

Use regular expressions for more compex search operations. Here you only need to find Name: so you can use normal string operations like startswith() or find().

Best regards
/Fredrik

Hi,

As far as my understanding goes, its only when it starts with "Name:" i can use the code snippet provided. But what if i need to search for the string "Name:" and display the values corresponding to it.

e.g if i have a format like mentioned below:

### Name: John
Age: 23

*** Name: Paul
Age: 24

Here how do i go about searching for the string "Name:" and displaying all the matching content for the string on the screen.

Kindly clarify my doubt.

Thanks,
BK

[fuffens]

This will do it...

file = open('name.txt', 'r')
for line in file:
    if line.find('Name:') >= 0:
        name = line.split()[-1]
        print name
file.close()

You can use find to check if a string is included in a string. It will return a negative number if not included. You can still use split() to extract the name. [-1] will give you the last element of the split list.

/Fredrik

[bkunjitam]

This will do it...

file = open('name.txt', 'r')
for line in file:
    if line.find('Name:') >= 0:
        name = line.split()[-1]
        print name
file.close()

You can use find to check if a string is included in a string. It will return a negative number if not included. You can still use split() to extract the name. [-1] will give you the last element of the split list.

/Fredrik

Thanks a lot Fredrik. It was very helpful

Thanks,
BK

[bvdet]

This works also:

if 'Name' in line: