python中的格式数字，带有前导零和固定的小数位

Question

I am trying to format a number into a string in python. The result I hope for is for 0.1423 to be converted to 000.14 . I tried

num = 0.1423
print '%0.2f' %num

But this just results in the 0.14 . I can't seem to get the leading zeros.

Cheers, James

Answer 1

num = 0.1423
print '%06.2f' %num

The six indicates the total field width and includes the decimal point. The zero indicates include leading zeros, the 2 indicates the precision.

Answer 2

The field width has to be provided as well to get the required number of leading zeros:

print "%06.2f" % num

Output:

000.14

Answer 3

使用str.format

 print "{:06.2f}".format(num)