处理小数位/避免使用科学计数法Python

Question

I have 2 Strings namely

string1 = '1000000000.0'
string2 = '1000000000.09'
from decimal import Decimal
Decimal(string1).normalize() 

gives

Decimal('1E+9')

and

Decimal(string2).normalize()

gives

Decimal('1000000000.09')

Which i actually want like the above.

so how can string1 be as Decimal(1000000000) instead of Decimal('1E+9') and string2 as Decimal('1000000000.09') which i get in currently.!!

Answer 1

You probably want to use string formatting. This gives you very close control over how your data is represented - see the documentation on str.format for a full (and a little complex for a beginner) explanation.

To answer your specific request:

from decimal import Decimal

string1 = '1000000000.0'
string2 = '1000000000.09'
fstr = '{:10.0f} {:12.2f}'

print(fstr.format(Decimal(string1), Decimal(string2)))

You should find the output is

1000000000 1000000000.09

To make your output easier to understand by humans, you might want to change fstr to '{:10,.0f} {:12,.2f}' - the commas indicate that the integer part is to be split into comma-separated groups of three, and you should see the output

1,000,000,000 1,000,000,000.09

Answer 2

This Functions Do the Trick

def DecimalHandler(string):

if re.match('^\d*[.]?\d*$',string):

    Frst = string.split('.')[0]
    try:
        secnd = string.split('.')[1]

        secnd = re.sub('[0]+$','',secnd)
        if secnd != '' :
            secnd = '.'+secnd
        else:
            secnd = secnd

    except IndexError:
        secnd = ''


    OutPut_Str = Frst+secnd
else:
    print("...")
    OutPut_Str = string

return(OutPut_Str)