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Working on a python assignment and was curious as to what [:-1] means in the context of the following code: instructions = f.readline()[:-1] Have searched on here on S.O. and on Google but to no avail. Would love an explanation!
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BetaHow to reverse a Python list using 1 in Python? The negative slicing and negative indexing can be applied to reverse a string or list in python. Let us take a string named “GURU99” to illustrate an example. Example. Python Code: b= "GURU99" print ("The list is", b) Substring=b[::-1] print (" The reverse of string GURU99 is", Substring) Output:
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BetaHere, we specify a start of index 2, no end, and a step of -1. Slicing here will start from index 2 which is 3. The negative steps mean the next value in the slice will be at an index smaller than the previous index by 1. This means 2 - 1 which is 1 so the value at this index, which is 2 will be added to the slice.
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BetaSets each bit to 1 if both bits are 1: x & y: Try it » | OR: Sets each bit to 1 if one of two bits is 1: x | y: Try it » ^ XOR: Sets each bit to 1 if only one of two bits is 1: x ^ y: Try it » ~ NOT: Inverts all the bits ~x: Try it » << Zero fill left shift: Shift left by pushing zeros in from the right and let the leftmost bits fall off: x ...
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BetaIf you leave slots empty, there's a default. [:] means: The whole thing. [::1] means: Start at the beginning, end when it ends, walk in steps of 1 (which is the default, so you don't even need to write it). [::-1] means: Start at the end (the minus does that for you), ... In Python, the syntax `[::-1]` is used to reverse a string.
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BetaTo get the same result , you cannot fill out all three, you can put <start> as len(a)-1, but there is no <stop> index you can put to get the first element. Example - a[len(a)-1::-1].This is because <stop> index is exclusive, that is the element at that index is not taken in, also -1 means the last element , so there is no index that can be used to include the first element , other than leaving ...
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BetaDescription¶. Subtracts a value from the variable and assigns the result to that variable.
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BetaPython Comparison Operators. Comparison operators are used to compare two values.They return a Boolean value (True or False) based on the comparison result.These operators are often used in conjunction with if/else statements in order to control the flow of a program. For example, the code block below allows the user to select an option from a menu:
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BetaIn Python, lists are dynamic which means that they allow further adding elements unlike many other languages. In this article, we are going to explore different methods to add elements in a list. For example, let's add an element in the list using append() method:Pythona = [1, 2, 3] a.append(4) prin.
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BetaPython has no character data type so single character is a string of length 1. Python. s = "GfG" print (s [1]) # access 2nd char s1 = s + s [0] # update print (s1) # print. Output f GfGG In this example, s holds the value "GfG ... Strings in Python are "immutable" which means they can not be changed after they are created. Some other ...
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