Python 3 Beginner's Reference Cheat Sheet, Cheat Sheet of Programming Languages

Download Python 3 Beginner's Reference Cheat Sheet and more Cheat Sheet Programming Languages in PDF only on Docsity! Python 3 Beginner's Reference Cheat Sheet Special characters # coment \n new line \<char> scape char Numeric operators + addition - subtraction * multiplication / division ** exponent % modulus // floor division Boolean operators == equal != different > higher < lower >= higher or equal <= lower or equal String methods string.upper() converts to uppercase string.lower() converts to lowercase string.count(x) counts how many times x appears string.find(x) position of the x first occurrence string.replace(x,y) replaces x for y string.strip(x) returns a list of values delimited by x string.join(L) returns a string with L values joined by string string.format(x) returns a string that includes formatted x List methods list.append(x) adds x to the end of the list list.extend(L) appends L to the end of the list list.insert(i,x) inserts x at i position list.remove(x) removes the first list item whose value is x list.pop(i) removes the item at position i and returns its value list.clear() removes all items from the list list.index(x) returns a list of values delimited by x list.count(x) returns a string with list values joined by S list.sort() sorts list items list.reverse() reverses list elements list.copy() returns a copy of the list Dictionary methods dict.keys() returns a list of keys dict.values() returns a list of values dict.items() returns a list of pairs (key,value) dict.get(k) returns the value associtated to the key k dict.pop() removes the item associated to the key and returns its value dict.update(D) adds keys-values (D) to dictionary dict.clear() removes all keys-values from the dictionary dict.copy() returns a copy of the dictionary Main data types boolean = True / False integer = 10 float = 10.01 string = “123abc” list = [ value1, value2, … ] dictionary = { key1:value1, key2:value2, …} String operations string[i] retrieves character at position i string[-1] retrieves last character string[i:j] retrieves characters in range i to j dict = {} defines an empty dictionary dict[k] = x stores x associated to key k dict[k] retrieves the item with key k del dict[k] removes the item with key k List operations list = [] defines an empty list list[i] = x stores x with index i list[i] retrieves the item with index I list[-1] retrieves last item list[i:j] retrieves items in the range i to j del list[i] removes the item with index i Dictionary operations and logical AND or logical OR not logical NOT Comparison operators Alvaro Sebastian http://www.sixthresearcher.com Legend: x,y stand for any kind of data values, s for a string, n for a number, L for a list where i,j are list indexes, D stands for a dictionary and k is a dictionary key.