On 2017-09-01 18:13, Ganesh Pal wrote:
In the fixed length string i.e "a0000",last 4 bits i.e "0000" should be
replaced by the user provided value ( the value is between 0001 + f f f f )
. I intend to form final_string using a fixed_string and an user provided
user_string
Example:
fixed_string = "a0000"
user_string ='1'
final string = fixed_string and user_string
Example :
"a0000" and "1" => a0001
"a0000" and "aa" => c00aa
PS : "and" this is not logical and it's just for example
If I concatenation using + or += or it's append the value at the end of
the string
"a0000" + "1" ===> expected was a0001
'a00001'
I am on python 2.7 and Linux , any ideas that you recommend to handle
this
How long is user_string? len(user_string)
Truncate fixed_string by that many characters: fixed_string[ :
-len(user_string)]
Then append the user_string: fixed_string[ : -len(user_string)] +
user_string
Example:
>>> fixed_string = "a0000"
>>> user_string ='1'
>>> len(user_string)
1
>>> fixed_string[ : -len(user_string)]
'a000'
>>> fixed_string[ : -len(user_string)] + user_string
'a0001'
Note: this won't work properly if len(user_string) == 0, so if that
could happen, just skip it. (Appending an empty string has no effect
anyway!)
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