如果小数点前没有值，则加零（在Python 2.7中）

Question

I have the following values:

.03
.04
1.23

I would like to add 0 to any of the values that do not have a value before the decimal place. So the output would be:

0.03
0.04
1.23

Answer 1

assuming that what you have are strings, in this case, ever the ever so simple

print (float(a)) 

works example

print (float(".03"))

0.03

Answer 2

if n is your number, this should get you what you want

'%03.2f' % n

If you want other options, see this link https://pyformat.info/#number for plenty of information about formatting numbers and strings in python.

Answer 3

try:

z = format(.03, 'f')
print z