resolve environment variables in string - regular expression

[Kai Rosenthal]

Hello,

how can I resolve envionment variables in a string.
e.g.

strVar = /myVar
resolve in
str1 = /mytest02/$MYVAR/mytest02 --/mytest02//myVar/mytest02
(unix)
str2 =$MYVAR/mytest03 --/myVar/mytest03 (unix)
str3 =%MYVAR%/mytest03 --/myVar/mytest03 (windows)
I would not set the variables in this time.

I think I need a little regular expression code snippet, but I have
not work with regular expression before.

Thanks for your help, Kai.

[bruno.desthuilliers]

On 9 fév, 12:30, "Kai Rosenthal" <[e-mail]:

Hello,

how can I resolve envionment variables in a string.
e.g.

strVar = /myVar
resolve in

nothing. This raises a SyntaxError. Python is *not* a shell script
language.

str1 = /mytest02/$MYVAR/mytest02 --/mytest02//myVar/mytest02
(unix)
str2 =$MYVAR/mytest03 --/myVar/mytest03 (unix)
str3 =%MYVAR%/mytest03 --/myVar/mytest03 (windows)
I would not set the variables in this time.

I think I need a little regular expression code snippet,

Nope.

my_var = "/myVar"
str1 = "/mytest02/%s/mytest02" % my_var
str2 = "%(my_var)s/mytest03" % {'my_var': my_var}
import os
str3=os.path.join(my_var, "mytest03")

hth

[Paul McGuire]

On Feb 9, 6:47 am, "[e-mail]"
<[e-mail]:

On 9 fév, 12:30, "Kai Rosenthal" <[e-mail]:

Hello,

how can I resolve envionment variables in a string.
e.g.

strVar = /myVar
resolve in

nothing. This raises a SyntaxError. Python is *not* a shell script
language.

str1 = /mytest02/$MYVAR/mytest02 --/mytest02//myVar/mytest02
(unix)
str2 =$MYVAR/mytest03 --/myVar/mytest03 (unix)
str3 =%MYVAR%/mytest03 --/myVar/mytest03 (windows)
I would not set the variables in this time.

I think I need a little regular expression code snippet,

Nope.

my_var = "/myVar"
str1 = "/mytest02/%s/mytest02" % my_var
str2 = "%(my_var)s/mytest03" % {'my_var': my_var}
import os
str3=os.path.join(my_var, "mytest03")

hth

Here's a pyparsing snippet to maybe do what you want.

-- Paul
from pyparsing import Word,alphas
import os

substitutionVar = Word("$",alphas+"_")
substitutionVar.setParseAction( lambda t: os.getenv(t[0][1:],t[0]) )

envsub = lambda s : substitutionVar.transformString(s)

test = "$TEMP/mytest03"
print envsub(test)

prints:
C:\DOCUME~1\Paul\LOCALS~1\Temp/mytest03