Python Interviews

n % k == 0
 * Check whether a number is divisible by another number using the modulus operator, %

f=open('text.txt','r') l=f.readlines for i in l:    print(i.strip('\n'))
 * Open a file:


 * List Comprehension

[x**2 for x in range(1,11) if x % 2 == 1] [x for x in range(1,11) if x % 2 == 0]

[start : stop : steps]
 * Slicing Operator:

10//5 = 2 10.0//5.0 = 2.0 10.0//4 = 2.0 10.0//7 = 1.0
 * Floor Division operator used for dividing two operands with the result as quotient showing only digits before the decimal point:

List is mutable while the Tuple is not. A tuple is allowed to be hashed. E.g: using it as a key for dictionaries.
 * List vs. Tuple.

List: a = [1,3,6] Tuple: b = (1,4,8)

Def can hold multiple expressions while lambda is a uni-expression function. Def generates a function and designates a name to call it later. Lambda forms a function object and returns it. Def can have a return statement. Lambda can’t have return statements. Lambda supports to get used inside a list and dictionary.
 * Lambda vs. def.

“else” clause: It is useful if you want to run a piece of code when the try block doesn’t create an exception. “finally” clause: It is useful when you want to execute some steps which run, irrespective of whether there occurs an exception or not.
 * Optional statements possible inside a try-except block: