Conversion of string to integer

[jupiter]

Hi guys,

I have a problem. I have a list which contains strings and numeric.
What I want is to compare them in loop, ignore string and create
another list of numeric values.

I tried int() and decimal() but without success.

eq of problem is

#hs=string.split(hs)
hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]

j=0
for o in range(len(hs)):
print hs[o],o
p=Decimal(hs[o])
if p 200: j+=j
print "-"*5,j
print "*"*25

I could be the best way to solve this ......?
@nil

[Wojciech =?ISO-8859-2?Q?Mu=B3a?=]

jupiter wrote:

I have a problem. I have a list which contains strings and numeric.
What I want is to compare them in loop, ignore string and create
another list of numeric values.

I tried int() and decimal() but without success.

eq of problem is

#hs=string.split(hs)
hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]

tmp = []
for s in hs:
try:
tmp.append( float(s) )
except ValueError:
# function float raises VE, if string 's' doesn't
# represent a number
pass

# tmp contains a list of floats

[Adam]

On Jan 29, 1:55 pm, "jupiter" <[e-mail]:

Hi guys,

I have a problem. I have a list which contains strings and numeric.
What I want is to compare them in loop, ignore string and create
another list of numeric values.

You can iterate over the list and use the type() function to work out
what each entry and choose what to do with it.

type() works like so:
###Code###

>>a = ["test", 1.25, "test2"]
if type(a[2]) == str:

print "a string"
a string

>>>

###End Code###

Adam

[wittempj]

On Jan 29, 2:55 pm, "jupiter" <[e-mail]:

Hi guys,

I have a problem. I have a list which contains strings and numeric.
What I want is to compare them in loop, ignore string and create
another list of numeric values.

I tried int() and decimal() but without success.

eq of problem is

#hs=string.split(hs)
hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]

j=0
for o in range(len(hs)):
print hs[o],o
p=Decimal(hs[o])
if p 200: j+=j
print "-"*5,j
print "*"*25

I could be the best way to solve this ......?

@nil

function isinstance can help you to determine the type/class of an
object:

py>hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]
py>
py>for i in hs:
py if isinstance(i, str):
py print str(i)
py elif isinstance(i, float):
py print float(i)
py elif isinstance(i, int):
py print int(i)
py else:
py print 'dunno type of this element: %s' % str(i)
popopopopop
254.25
pojdjdkjdhhjdccc
25452.25

[John Machin]

On Jan 30, 6:48 am, "[e-mail]" <[e-mail]>
wrote:

On Jan 29, 2:55 pm, "jupiter" <[e-mail]:

Hi guys,

I have a problem. I have a list which contains strings and numeric.
What I want is to compare them in loop, ignore string and create
another list of numeric values.

I tried int() and decimal() but without success.

eq of problem is

#hs=string.split(hs)
hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]

j=0
for o in range(len(hs)):
print hs[o],o
p=Decimal(hs[o])
if p 200: j+=j
print "-"*5,j
print "*"*25

I could be the best way to solve this ......?

@nilfunction isinstance can help you to determine the type/class of an

object:

py>hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]
py>
py>for i in hs:
py if isinstance(i, str):
py print str(i)
py elif isinstance(i, float):
py print float(i)
py elif isinstance(i, int):
py print int(i)
py else:
py print 'dunno type of this element: %s' % str(i)
popopopopop
254.25
pojdjdkjdhhjdccc
25452.25

Call me crazy, but I can't understand what the above code is meant to
demonstrate.

(1) All of the elements in "hs" are *known* to be of type str. The
above code never reaches the first elif. The OP's problem appears to
be to distinguish which elements can be *converted* to a numeric type.

(2) if isinstance(i, some_type) is true, then (usually) some_type(i)
does exactly nothing that is useful

Awaiting enlightenment ...

John

[Thinker]

jupiter wrote:

Hi guys,

I have a problem. I have a list which contains strings and numeric.
What I want is to compare them in loop, ignore string and create
another list of numeric values.

I tried int() and decimal() but without success.

eq of problem is

#hs=string.split(hs)
hs =["popopopopop","254.25","pojdjdkjdhhjdccc","25452.2 5"]

hs = [.............]

import re
reo = re.compile(r'^[0-9]+(\.[0-9]+)?$')
result = [e for e in hs if reo.match(e)]

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Thinker Li - th*****@branda.to th********@gmail.com
http://heaven.branda.to/~thinker/GinGin_CGI.py