Python parsing out parts of a string -


i have string can this:

scenario 1: "some_field=(parameter_a-0-(8.869834109e-05))/(0.001*10)"

or

scenario 2: "some_field=(parameter_a-(0.0005883943))/(0.001*10)"

how can parse out numbers in decimal format below?

scenario 1: first number: -0.00008869834109 second number: 0.01

scenario 2: first number: 0.0005883943 second number: 0.01

the string format stays same number format , polarities can change.

i think main work extract pieces contain numbers surrounding characters. can done .split() , .find(), .rfind() , indexing within character strings.

my code assumes there 1 equal sign '=', number parts separated '/' , each enclosed in round brackets (in innermost if there more on bracket level), , there might sign directly left of inner-most bracket.

content = "some_field=(parameter_a-0-(8.869834109e-05))/(0.001*10)" content = "some_field=(parameter_a-(0.0005883943))/(0.001*10)" #or way ever give character strings  content = content.split('=')  #split @ equal sign if(len(content) != 2) :  #check 1 equal sign   print ('something wrong in data?')   #in case information left of equal sign needed fieldname = content[0]  content = content[1]  #now work on part right of '=' content = content.split('/')  values = [] in range(len(content)):   x = content[i]    pos_open  = x.rfind( '(' ) #find position of opening bracket '(', starting right--> finds right-most   pos_close = x.find( ')' )   #hence, digits in x[pos_open+1:pos_close]  check uncommenting following line   #print( x[pos_open+1:pos_close]  )    #check whether there multiplication included in part   if ( x[pos_open+1:pos_close].find('*') < 0 ) :    # .find() returns -1 if character sequence not found     val = float(  x[pos_open+1:pos_close]   )    # float() main work of conversion    else:     pos_dot = x[pos_open+1:pos_close].find('*')     factor1 = float(  x[pos_open+1:  pos_open+1 + pos_dot]  )     factor2 = float(  x[pos_open+1 + pos_dot+1 : pos_close] )     val = factor1 * factor2    #check negative sign:  (sorry, examples not show how sign specified)   if (pos_open > 0 , x[pos_open - 1] == '-'):  # checks character before bracket     #note: in case of pos_open=0, second part x[pos_open - 1] @ last character x[-1]     val = -val    values.append(val)  #output print ('first: {0}  second: {1}' .format(values[0], values[1]) ) #standard way print ('first: ' + repr(values[0]) + '  second: ' + repr(values[1]) ) #another standard way  print ('first: {0:.12f}  second: {1:.7f}' .format(values[0], values[1]) ) # format specified in 2 exemplary ways

the extraction part of code work if there more 2 numbers stored in character string, grabs 1 group of characters @ time , appends determined value val list values.


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