Hello folks....!!!
Today we are going to see how to zip and unzip python elements.
name=[a,b,c,d,e]
marks=[23,56,34,78,90]
Zip( ) in Python
Zip() function is used to combine items from multiple containers into one based on their index. For example, Consider 2 lists:name=[a,b,c,d,e]
marks=[23,56,34,78,90]
Now let us pass these two lists to zip function :
You cannot directly use the output of zip(), it has to be converted to list or any other suitable data structure. Mostly we convert it to list. So the conversion is done using list() method. Look at the code below :
Look at the output. The item at index '0' in both the lists are zipped together. They are mapped based on their index. In the similar way all the items in both the containers(lists) are grouped.
Even different type of containers can be zipped. Look at the example below:
Here I have added a dictionary to our code and passed it to zip(). But note that only the keys of the dictionary are considered for zipping. To overcome this, we can pass the dictionary parameter as 'new.items()'. So the code is written as:
Now the key and value pair appear in the final result. In the similar way one can write code for considering either keys only or values only also.
You cannot directly use the output of zip(), it has to be converted to list or any other suitable data structure. Mostly we convert it to list. So the conversion is done using list() method. Look at the code below :
Look at the output. The item at index '0' in both the lists are zipped together. They are mapped based on their index. In the similar way all the items in both the containers(lists) are grouped.
Even different type of containers can be zipped. Look at the example below:
Here I have added a dictionary to our code and passed it to zip(). But note that only the keys of the dictionary are considered for zipping. To overcome this, we can pass the dictionary parameter as 'new.items()'. So the code is written as:
Now the key and value pair appear in the final result. In the similar way one can write code for considering either keys only or values only also.
Unzipping elements in Python
For unzipping the zipped elements, we have to use the same zip(), but the difference is the parameter we pass. We need to pass the zipped element with a preceding '*'. Look at the example below:
- Here, we combined two lists. So while unzipping we use two variables n, m.
- The zipped contents are mapped back to their respective indices.
Now consider the example where we zipped a dictionary along with the
lists. What will be the outcome on unzipping it...??
After unzipping, the dictionary will be unzipped as tuple. S we need to
convert it back to dictionary. So the code should be modified as :
We add one more line as "d=dict(d)", which coverts the tuples into dictionary.
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