python, wihtout using (replace, find, index) insert_substrings_into_string(s, substrs): This function takes a string s and a string substrs. The substrs string will contain 0 or more comma-separated substrings. The string s will contain text with 0 or more special placeholder character sequences. These placeholder character sequences will always begin with the percent character %, followed by one or more digits. The function will create a new string from the original string s where all the
In python, wihtout using
(replace, find, index)
insert_substrings_into_string(s, substrs): This function takes a string s and a string substrs.
The substrs string will contain 0 or more comma-separated substrings. The string s will contain
text with 0 or more special placeholder character sequences. These placeholder character sequences
will always begin with the percent character %, followed by one or more digits. The function will
create a new string from the original string s where all the placeholder character sequences in s
are replaced by the substrings in the string substrs. The placeholder %0 should be replaced by
the first substring in substrs (i.e., everything before the first comma, if such a comma exists).
The placeholder %1 should be replaced by the second substring in substrs (i.e., everything between
the first and second comma, if such a comma exists), and so on. The new string should then be
returned.
Note: If a placeholder sequence refers to an invalid index (e.g., %10 when there are only five substrings
in substrs), then include the sequence (e.g., %10) as is in the new string.
Note: The order of the placeholder sequences in s may not always be increasing. For instance, %2
may appear before %1. Also, the same placeholder sequence could be repeated (e.g., %2 could appear
at one point in s and again at a later point). Each instance of the same sequence would thus be
replaced by the same value.
>>> insert_substrings_into_string("My favorite %0 is %1!!!", "
Python")
'My favorite programming language is Python!!!'
>>> insert_substrings_into_string("Once upon a midnight %0, while I %1, %2 and %3", \
"dreary, pondered, weak, weary")
'Once upon a midnight dreary, while I pondered, weak and weary'
>>> insert_substrings_into_string("Once upon a midnight %0, while I %1", "dreary")
'Once upon a midnight dreary, while I %1'
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