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An array is a collection of elements of the same type. Delf Stack is a learning website of different programming languages. The above Python code we can use to append 0 to a string in Python.. Read: Python generate random number and string Append character to a string python. One thing to note: all elements in the list will have initially the same id (or memory address). array When you open with "a" mode, the write position will always be at the end of the file (an append). Append the list as you get to a list. Loop over an array in JavaScript. Python for loop in one line with if else condition. The for loop in Python is used to iterate over a sequence, which could be a list, tuple, array, or string. When you open with "a" mode, the write position will always be at the end of the file (an append). 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