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• Mar 30, 2012 Dictionaries are the fundamental data structure in Python, and a key tool in any Python programmer’s arsenal. They allow O(1) lookup speed, and have been heavily optimized for memory overhead and lookup speed efficiency. Today I”m going to show you three ways of constructing a Python dictionary, as well as some additional tips and tricks.
• Now, let’s see different ways of creating a dictionary of list. Note that the restriction with keys in Python dictionary is only immutable data types can be used as keys, which means we cannot use a dictionary of list as a key.
• Jun 12, 2018  All the keys in dictionary will be converted to column names and lists in each its value field will we converted to column Data. Create DataFrame from Dictionary with custom indexes We can also pass the index list to the DataFrame constructor to replace the default index list i.e.

• Generating A Dictoary With Key From A Set Youtube
• Generating A Dictionary With Key From A Setting
• Generating A Dictoary With Key From A Set Number
• Generating A Dictionary With Key From A Set Crossword

Dictionary

A dictionary is a collection which is unordered, changeable and indexed. In Python dictionaries are written with curly brackets, and they have keys and values.

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A dictionary is a collection which is unordered, changeable and indexed. In Python dictionaries are written with curly brackets, and they have keys and values. So I specify the options in a compact dictionary containing the name of the parameter, and a list of values to test, and then convert that into a list of single-entry-per-key dictionaries that contain all possible permutations of those configuration parameters. This is a more complicated version of the problem but it is still essentially creating a dictionary with a for loop. I wanted to create a database of all my photos/videos on my computer - 1000s of them and create a dictionary record for each photo which used the name of the photo/movie to identify the record. Python: How to Remove multiple keys from Dictionary while Iterating? Python: How to create a list of all the Values in a dictionary? Python: How to check if a key exists in dictionary? Python: How to find keys by value in dictionary? Python: How to add / append key value pairs in dictionary using dict.update.

Example

Create and print a dictionary:

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Accessing Items

You can access the items of a dictionary by referring to its key name, inside square brackets:

Example

Get the value of the 'model' key:

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There is also a method called get() that will give you the same result:

Example

Get the value of the 'model' key:

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Change Values

You can change the value of a specific item by referring to its key name:

Example

Change the 'year' to 2018:

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Loop Through a Dictionary

You can loop through a dictionary by using a for loop.

When looping through a dictionary, the return value are the keys of the dictionary, but there are methods to return the values as well.

Example

Print all key names in the dictionary, one by one:

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Example

Print all values in the dictionary, one by one:

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Example

You can also use the values() function to return values of a dictionary:

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Example

Loop through both keys and values, by using the items() function:

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Check if Key Exists

To determine if a specified key is present in a dictionary use the in keyword:

Example

Check if 'model' is present in the dictionary:

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Dictionary Length

To determine how many items (key-value pairs) a dictionary has, use the len() method.

Example

Print the number of items in the dictionary:

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Adding Items

Adding an item to the dictionary is done by using a new index key and assigning a value to it:

Example

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Removing Items

There are several methods to remove items from a dictionary:

Example

The pop() method removes the item with the specified key name:

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Example

The popitem() method removes the last inserted item (in versions before 3.7, a random item is removed instead):

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Example

The del keyword removes the item with the specified key name:

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Example

The del keyword can also delete the dictionary completely:

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Example

The clear() method empties the dictionary:

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Copy a Dictionary

You cannot copy a dictionary simply by typing dict2 = dict1, because: dict2 will only be a reference to dict1, and changes made in dict1 will automatically also be made in dict2.

There are ways to make a copy, one way is to use the built-in Dictionary method copy().

Example

Make a copy of a dictionary with the copy() method:

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Another way to make a copy is to use the built-in method dict().

Example

Make a copy of a dictionary with the dict() method:

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Nested Dictionaries

A dictionary can also contain many dictionaries, this is called nested dictionaries.

Example

Create a dictionary that contain three dictionaries:

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Or, if you want to nest three dictionaries that already exists as dictionaries:

Example

Create three dictionaries, than create one dictionary that will contain the other three dictionaries:

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The dict() Constructor

It is also possible to use the dict() constructor to make a new dictionary:

Example

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Dictionary Methods

Python has a set of built-in methods that you can use on dictionaries.

Method	Description
clear()	Removes all the elements from the dictionary
copy()	Returns a copy of the dictionary
fromkeys()	Returns a dictionary with the specified keys and value
get()	Returns the value of the specified key
items()	Returns a list containing a tuple for each key value pair
keys()	Returns a list containing the dictionary's keys
pop()	Removes the element with the specified key
popitem()	Removes the last inserted key-value pair
setdefault()	Returns the value of the specified key. If the key does not exist: insert the key, with the specified value
update()	Updates the dictionary with the specified key-value pairs
values()	Returns a list of all the values in the dictionary

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Generating A Dictionary With Key From A Set Crossword