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Category: Python

Generators in Python

In previous articles I’ve wrote about how to create an iterator in Python by implementing iterator protocolor using the yield keyword. In this article I’ll describe generators: a piece of Python syntax that can turn many iterators into one-liners.

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Anatomy of a Python Iterator

Iterator is a powerful pattern that was recognised at least as early as 1994 and since then it was incorporated in syntax of almost every modern programming language.

Python also implements this pattern providing a pithy and concise syntax to iterate over lists, maps, dictionaries and other data structures:

for i in [1, 2, 3, 4]:
    print i

In this article I will write about how an iterator is used in Python, how to implement your own iterator and what types of iterators exist in Python.

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Python in One Hour. Part 1

This is a relatively short and concise article that will give you all that you need to know to start reading/writing Python code. It will start with defining a variable and will discuss types, data structures, if-else statements, loops, and functions.

This tutorial does not require any prior knowledge of Python. The only prerequisite for this article is knowledge of basics of any other object-oriented programming language.

Most of the examples in this article are applicable in both Python 2 and Python 3. I point to differences between Python versions where applicable.

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How to implement string interpolation in Python

String interpolation is a process of substituting values of local variables into placeholders in a string.

It is implemented in many programming languages such as Scala:

//Scala 2.10+
var name = "John";
println(s"My name is $name")
>>> My name is John


my $name = "John";
print "My name is $name";
>>> My name is John


name = "John"
console.log "My name is #{name}"
>>> My name is John

and many others.

On the first sight, it doesn’t seem that it’s possible to use string interpolation in Python. However, we can implement it with just 2 lines of Python code.

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