Govt. Exams
Entrance Exams
my_list = [1, 2, 3, 4, 5]
print(my_list[::-1])
Slice [::-1] reverses the list by using step -1 (backwards through entire list). It returns a reversed copy.
my_list = [1, 2, 3]
my_list.insert(1, 99)
print(my_list)
insert(1, 99) inserts 99 at index 1, shifting existing elements right. Result is [1, 99, 2, 3].
my_list = [1, 2, 3, 4, 5]
print(my_list[-2])
Negative indexing starts from the end: -1 is 5, -2 is 4, -3 is 3, etc. So -2 returns 4.
Both .copy() method and list() constructor create shallow copies. Simple assignment creates only a reference.
my_list = [1, 2, 3]
my_list_copy = my_list
my_list[0] = 99
print(my_list_copy[0])
Assignment creates a reference, not a copy. Both variables point to the same list object, so changes are reflected in both.
Lambda functions are functions in Python. type(lambda x: x) returns <class 'function'>.
x = 5 is a class variable. It can be accessed via A.x and modified via A.x = new_value or instance modification.
Dictionary comprehension creates {0: 0, 1: 1, 2: 4} where keys are from range(3) and values are their squares.
The 'with' statement ensures the file is automatically closed when the block exits, even if an error occurs.
eval() evaluates the string as Python code following operator precedence. 2+3*4 = 2+12 = 14.
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