#ai | search
Click here to view #ai news from 60+ newspapers.
Bookmark or Share- How do I get a substring of a string in Python? - Stack Overflowa="I Am Siva". print(a[2:]) OUTPUT: >>> Am Siva. In the above code a [2:] declares to print a from index 2 till the last element. Remember that if you set the maximum limit to print a string, as (x) then it will print the string till (x-1) and also remember that the index of a list or string will always start from 0.
- What does this regular expression mean /^[a-z]{1}[a-z0-9_]{3,13}$/The ^ anchor asserts that we are at the beginning of the string. [a-z]{1} matches one lower-case letter. The {1} is unneeded. [a-z0-9_]{3,13} matches 3 to 13 chars. In case-insensitive mode, in many engines it could be replaced by \w{3,13} The $ anchor asserts that we are at the end of the string.
- What is the difference between i = i + 1 and i += 1 in a 'for' loop?The difference is that one modifies the data-structure itself (in-place operation) b += 1 while the other just reassigns the variable a = a + 1. Just for completeness: x += y is not always doing an in-place operation, there are (at least) three exceptions: If x doesn't implement an __iadd__ method then the x += y statement is just a shorthand ...
- c - What is the difference between ++i and i++? - Stack Overflowi initial value: 0; value returned by i++: 0, i after: 1. i initial value: 0; value returned by ++i: 1, i after: 1. So basically ++i returns the value after it is incremented, while i++ return the value before it is incremented. At the end, in both cases the i will have its value incremented.
- How does the Python's range function work? - Stack OverflowThe range function wil give you a list of numbers, while the for loop will iterate through the list and execute the given code for each of its items. for i in range(5): print i. This simply executes print i five times, for i ranging from 0 to 4. for i in range(5): a=i+1. This will execute a=i+1 five times.
More
