Data Wrangling with Python: Tips and Tools to Make Your Life by Jacqueline Kazil

By Jacqueline Kazil

How do you are taking your facts research abilities past Excel to the following point? by means of studying simply enough Python to get stuff performed. This hands-on advisor exhibits non-programmers such as you the right way to procedure info that is before everything too messy or tricky to entry. you do not need to grasp something concerning the Python programming language to start. via a variety of step by step workouts, you will gather, fresh, study, and current info successfully. you will additionally become aware of tips to automate your facts method, time table dossier- enhancing and clean-up projects, procedure higher datasets, and create compelling tales with facts to procure.

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There are more types than the few core ones we learned about in this chapter, which are shown in Table 2-1. Table 2-1. 0 Variable animal_names List ['Joker', 'Simon', 'Ellie', 'Lishka', 'Fido'] Dictionary {'cats': 2, 'dogs': 5, 'horses': 1, 'snakes': 0} As you know, some data types can be contained within others. A list can be a bunch of strings or integers or a mixture of the two. A variable can be a list or a dictionary or a string or a decimal. As we saw with our variable animal_names, a list can also be a list of lists.

To call a variable is to ask Python for its value. Let’s call cats. Type cats into your interpreter. You should get 42 in return. csv' in return. info >>> dogs Traceback (most recent call last): File "", line 1, in NameError: name 'dogs' is not defined As stated earlier, it is important to learn how to read errors, so you can understand what you did wrong and how to fix it. In this example, the error says, dogs is not defined which means we did not define a variable named dogs. Python doesn’t know what we are asking it to call because we have not defined that variable.

This is extremely helpful when you are using a variable to hold data and need to know what type of data is in the variable. Consider the zip code example from earlier in the chapter. Here, we have two different uses for the value 20011. In the first case, it is a zip code stored as a string. In the second case, it is an integer: '20011' 20011 If those values were stored in variables, they would be further obscured and we might not know or remember whether we used a string or an integer. If we pass the value to the built-in method type, then Python will tell us what kind of data type the object is.

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