To Do "Lists" Never End
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Welcome back to Pandas Daily! Your daily 5-minute boost to becoming confident in Python. Today: Get hands-on with Python lists β master storing and managing of multiple items in one place. β If you are an absolute beginner you can glance through previous issues as well β A "list" is a datatype that can store multiple values as one variable. Yes you can stuff numbers, strings, anything together β π What does it look like? Reminder: print() is often used to display output
In [1]:
# List is represented by []
# 2,7 & 4 are "items" of the list numbers = [2, 7, 4] print(numbers)
Out [1]: [2, 7, 4]
β ποΈ As I said anything can be stuffed into a list
In [2]:
mix_list = ["Pandas", 2, "Is", 10.0]
print(mix_list)
Out [2]: ['Pandas', 2, 'Is', 10.0]
β β Verify using "type" if its the right data type
In [3]:
type(mix_list)
Out [3]: list
β π€― There can be a list of lists too
In [4]:
super_list = [
[1, 2, 3], [4, 5, 6], [7, 8, 9] ] print(super_list)
Out [4]: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
β π Unlike strings, length of list is the number of items in the list
In [5]:
len(mix_list)
Out [5]: 4
β π Going one level deeper β πΆββοΈπΆββοΈ Similar to what we saw for strings yesterday, list items also have positions starting 0
In [6]:# Access 1st item
mix_list[0]
Out [6]: Pandas
β
In [7]:# Access 2nd
mix_list[1]
Out [7]: 2
β
In [8]:
# Get first 2 items - 0,1
mix_list[:2]
Out [8]: ['Pandas', 2]
β
In [9]:
# Access last element
mix_list[-1]
Out [9]: 10.0
β π οΈ Tweaking Lists β π Add 1 element at the end
In [10]:
mix_list.append("awesome")
mix_list
Out [10]: ['Pandas', 2, 'Is', 10.0, 'awesome']
β π Add 1 element at a specific position
In [11]:
# "insert" 9 at 2nd position
# Reminder 1 below implies 2nd position mix_list.insert(1, 9) mix_list
Out [11]: ['Pandas', 9, 2, 'Is', 10.0, 'awesome']
β βοΈ Remove particular value
In [12]:
# Remove 9
mix_list.remove(9) mix_list
Out [12]: ['Pandas', 2, 'Is', 10.0, 'awesome']
β βοΈ Remove from specific position
In [13]:
# Remove by position
# 1 below means 2nd position mix_list.pop(1) mix_list
Out [13]: ['Pandas', 'Is', 10.0, 'awesome']
β π To Turnaround
In [14]:
mix_list.reverse()
mix_list
Out [14]: ['awesome', 10.0, 'Is', 'Pandas']
β πΆ Sorting Lists β Should be of same datatype.
In [15]:
numbers = [2, 7, 4]
numbers.sort() numbers
Out [15]: [2, 4, 7]
β
In [16]:
alphabet_list = [
"Please",
"Share",
"This",
"Newsletter"]
alphabet_list
Out [16]: ['Please', 'Share', 'This', 'Newsletter']
In [17]:
alphabet_list.sort()
alphabet_list
Out [17]: ['Newsletter', 'Please', 'Share', 'This']
βοΈ Why mix_list cannot be sorted and will give error. Reply if you know the answer. β Use "reverse = True" for sorting in descending order
In [18]:
alphabet_list.sort(reverse=True)
alphabet_list
Out [18]: ['This', 'Share', 'Please', 'Newsletter']
β π€π€ Simply add or use extend function to join lists
In [19]:
# alphabet_list.extend(numbers) will also give same result
alphabet_list + numbers
Out [19]: ['This', 'Share', 'Please', 'Newsletter', 2, 4, 7]
β Coming up tomorrow: Concept of Immutability (simple but important concept) and dictionaries. β βπ£ If you liked it, please share it with anyone who will find it useful and share your feedback below πΌ β
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Pandas Daily
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