Download Guide to Learning Python Decorators by Matt Harrison PDF

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By Matt Harrison

Decorators are lovely universal in Python. whereas now not strictly worthwhile, they could lessen code dimension whereas allowing regulate of functionality enter, invocation and output. Many reasons of decorators are short and go away the reader a bit of harassed. This publication is an try to therapy that. it truly is dependent off of renowned tutorials given at PyCon and Python person teams. with no fail, attendees point out that "decorators now make sense". not just do they comprehend them, yet they could write them besides.

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We can trace the execution of these statements step-by-step to see why. Suppose x and y start with the values 2 and 4. Let’s examine the logic of the program to see how the variables change. The following sequence uses comments to describe what happens to the variables as these two statements are executed: # # x # y # variables initial values = y now = x final x 2 y 4 4 4 4 4 See how the first statement clobbers the original value of x by assigning to it the value of y? When we then assign x to y in the second step, we just end up with two copies of the original y value.

The expression, 10 / 3 produces 3 because three gozinta (goes into) ten three times (with a remainder of one). While the result of integer division is always an integer, the data type of the result depends on the data type of the operands. A float integer-divided by a float produces a float with a 0 fractional component. The last two interactions demonstrate the remainder operation %. The remainder of integer-dividing 10 by 3 is 1. Notice again that the data type of the result depends on the type of the operands.

5 Assignment Statements One of the most important kinds of statements in Python is the assignment statement. We’ve already seen a number of these in our previous examples. 5. Assignment Statements 29 Here variable is an identifier and expr is an expression. The semantics of the assignment is that the expression on the right side is evaluated to produce a value, which is then associated with the variable named on the left side. 9 * x * (1 - x) fahrenheit = 9 / 5 * celsius + 32 x = 5 A variable can be assigned many times.

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