[20-SEC SUMMARY] Given a list of list stored in variable lst. To flatten a list of lists, use the list comprehension statement [x for l in lst for x in l]. To modify all elements in a list of lists (e.g., increment them by one), use a list comprehension of list comprehensions [[x+1 for x …
You can convert a list of lists to a Pandas DataFrame that provides you with powerful capabilities such as the to_csv() method. This is the easiest method and it allows you to avoid importing yet another library (I use Pandas in many Python projects anyways). Output: # file2.csv Alice,Data Scientist,122000 Bob,Engineer,77000 Ann,Manager,119000 You create a …
Problem: How to convert a list of lists to a csv file? Example: Given is a list of list—for example salary data of employees in a given company: Your goal is to write the content of the list of lists into a comma-separated-values (CSV) file format. Your outfile should look like this: # file.csv Alice,Data …
How to Convert a List of Lists to a CSV File in Python Read More »
Pandas is an open-source Python library that is powerful and flexible for data analysis. If there is something you want to do with data, the chances are it will be possible in pandas. There are a vast number of possibilities within pandas, but most users find themselves using the same methods time after time. In this …
[PDF Collection] 7 Beautiful Pandas Cheat Sheets — Post Them to Your Wall Read More »
If you’re in a hurry, here’s the short answer: use the list comprehension statement [list(x) for x in tuples] to convert each element in your tuples list to a list. This works also for list of tuples with varying number of elements. But there’s more to it and studying the two main method to achieve …
How to Convert List of Tuples to List of Lists in Python? Read More »
If you’re in a hurry, here’s the short answer: use the list comprehension statement [tuple(x) for x in list] to convert each element in your list to a tuple. This works also for list of lists with varying number of elements. But there’s more to it and studying the two main methods to achieve the …
How to Convert List of Lists to List of Tuples in Python? Read More »
Problem: You’re given a list of lists. Your goal is to convert it into a Pandas Dataframe. Example: Say, you want to compare salary data of different companies and job descriptions. You’ve obtained the following salary data set as a list of list: How can you convert this into a Pandas Dataframe? DataFrame() Solution: The …
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Short answer: Convert a list of lists—let’s call it l—to a NumPy array by using the standard np.array(l) function. This works even if the inner lists have a different number of elements. Convert List of Lists to 2D Array Problem: Given a list of lists in Python. How to convert it to a 2D NumPy …
For some applications, it’s quite useful to convert a list of lists into a dictionary. Databases: List of list is table where the inner lists are the database rows and you want to assign each row to a primary key in a new dictionary. Spreadsheet: List of list is two-dimensional spreadsheet data and you want …
How to Convert a List of List to a Dictionary in Python? Read More »
Say, you want to convert a list of lists lst=[[1, 2], [3, 4]] into a single list [1, 2, 3, 4]. How to achieve this? There are different options: List comprehension [x for l in lst for x in l] assuming you have a list of lists lst. Unpacking [*lst[0], *lst[1]] assuming you have a …
How to Convert a List of Lists Into A Single List Read More »
There’s an element of confusion regarding the term “lists of lists” in Python. I wrote this most comprehensive tutorial on list of lists in the world to remove all those confusions by beginners in the Python programming language. This multi-modal tutorial consists of: Source code to copy&paste in your own projects. Interactive code you can …
Python List of Lists – A Helpful Illustrated Guide to Nested Lists in Python Read More »
Problem: Given a Python tuple with n elements. How to convert it into a list with the same n elements? Examples: Convert tuple (1, 2, 3, 4, 5) into list [1, 2, 3, 4, 5]. Convert tuple (‘Alice’, ‘Bob’, ‘Ann’) into list [‘Alice’, ‘Bob’, ‘Ann’]. Convert tuple (1,) into list [1]. Note Tuple: Tuples are …