Title Python Cheat Sheet - IBM.pdf ✅

Python Cheat Sheet: The Basics Learn on Coursera Python for Data Science, AI & Development Python Data Types String Series of characters or data stored as text my_string = "Hello" String Operations # returns the string with all uppercase letters my_string.upper() # returns the length of a string len(my_string) # returns the index of the first instance of the string inside the # subject string, otherwise -1 my_string.find('l') # replaces any instance of the first string with the second in my_string my_string.replace('H', 'C') Integer A whole number my_integer = 12321 Float A decimal number my_decimal = 3.14 Boolean Discrete value true or false a = True b = False Dictionary Changeable collection of key value pairs my_dictionary = {'banana': 1, 12: 'laptop', (0,0):'center'} Dictionary Operations # Access value using key my_dictionary['banana'] # Get all keys in a dictionary as a list my_dictionary.keys() # Get all values in a dictionary as a list my_dictionary.values() Tuple Unchangeable collection of objects tup = (1, 3.12, False, "Hi") List Changeable collection of objects my_collection = [1, 1, 3.12, False, "Hi ] List Operations # returns the length of a list len(my_collection) # Add multiple items to a list my_collection.extend([ More", "Items"]) # Add a single item to a list my_collection.append("Single") # Delete the object of a list at a specified index del(my_collection[2]) # Clone a list clone = my_collection[:] # Concatenate two lists my_collection_2 = ["a", "b", "c"] my_collection_3 = my_collection + my_collection_2 # Calculate the sum of a list of ints or floats number_collection = [1,2,3,4.5] sum(number_collection) # Check if an item is in a list, returns Boolean item in my_collection # Check if an item is not in a list, returns Boolean item not in my_collection Set Unordered collection of unique objects a = {100, 3.12, False, "Bye"} b = {100, 3.12, "Welcome"} Set Operations # Convert a list to a set my_set = set([1,1,2,3]) # Add an item to the set a.add(4) # Remove an item from a set a.remove("Bye") # Returns set a minus b a.difference(b) # Returns intersection of set a and b a.intersection(b) # Returns the union of set a and b a.union(b) # Returns True if a is a subset of b, false otherwise a.issubset(b) # Returns True if a is a superset of b, false otherwise a.issuperset(b) Indexing Accessing data from a string, list, or tuple using an element number my_string[element_number] my_collection[element_number] my_tup[element_number] Slicing Accessing a subset of data from a string, list, or tuple using element numbers from start to stop 1 my_string[start:stop] my_collection[start:stop] my_tup[start:stop] Comparison Operators Comparison Operators compare operands and return a result of true or false Equal a == b Less Than a < b Greater Than a > b Greater Than or Equal a >= b Less Than or Equal a <= b Not Equal a != b Python Operators ¡ +: Additio ¡ : Subtractio ¡ *: Multiplicatio ¡ /: divisio ¡ //: Integer Division (Result rounded to the nearest integer) Conditional Operators Conditional Operators evaluate the operands and produce a true of false result And returns true if both statement a and b are true, otherwise false a and b Or returns true if either statement a or b are true, otherwise false a or b Not returns the opposite of the statement not a Page 1 © Copyright IBM Corporation 2021. All rights reserved.