pythonic approach to fixed-length strings given variable length input string

Question

I need to take a variable-length string and make it a fixed-length for struct.pack().

if the input string is:

longer than size, then it needs to be truncated
shorter than size, then it needs to be padded

there doesn't seem to be a one-line method for padding or truncating a string to a fixed length

what's simpler than this?

in_str='abcd1234'
size=12 # or 4
def make_str_this_len(in_str,size):
    if size<=len(in_str):
        out_str = in_str[0:size]
    else:
        out_str = in_str.ljust(size)
    return out_str

# printing string and its length
res=make_str_this_len(in_str,size)
print("resulting string:[{0}], len={1}".format(res,len(res)))

norie · Accepted Answer · 2021-07-09 13:40:41Z

1

How about this?

def make_str_this_len(in_str,size):
    return in_str.ljust(size)[0:size]

answered Jul 9, 2021 at 13:40

norie

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