Cheatography
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Input & OutputOutput a message to the user print("Hello There") | Ask the user for a text input (string) name = input("What is your name?") | Ask the user for a number input (Integer) age = int(input("How old are you?")) | Add a new line name = input("What is your name?\n") | Concatenate strings print("Hello "+ name ) | Concatenate different data types print("You are",age ,"years old") | Output the first letter print(name[0]) | Uppercase/Lowercase format print(name.upper()) | print(name.lower()) | Uppercase then lowercase format print(name[0].upper()+name[1:].lower()) |
IF StatementsIF
x = 3
if x == 3:
print("x = 3")
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IF / ELSE
x = 7
if x > 8:
print("Yes")
else:
print("No")
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ELIF
x = 4
if x > 8:
print("A")
elif x > 5:
print("B")
elif x > 2:
print("C")
else:
print("F") |
Remember to indent your code [Press the 'Tab' button n the keyboard] Editing ListsReplace third item mylist[2] = 43 | Insert in position mylist.insert(1, "OCR") | Add to the end of a list mylist.append("GCSE") | Remove all Sciences mylist.remove("Science) | Delete all items mylist = [] | Delete third item del mylist[2] | Reverse list order mylist.reverse() | Sort list order mylist.sort() | Join items using a space print(" ".join(mylist)) |
DictionariesCreating a dictionary mydict = {"a":1, "b":2, "c":3} | Returns the value of b mydict["b"] | Check in dictionary "c" in mydict | Display the keys mydict.keys() | Display keys and items mydict,items() |
| | InequalitiesEqual to x == 3 | Not equal to x != 4 | Less than / equal to x <= 2 | More than / equal to x >= 1 | Between two numbers <= 3 x <= 12 | AND x == 1 and z == 4 | OR x == "A" or x == "a" |
For LoopRepeat 5 times
for x in range (5):
print("Owen")
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Repeat length of string
for x in "Nathan":
print(x)
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Count from 1 to 10
for x in range (1,11):
print(x)
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Count from 1 to 10 in 2's
for x in range (1,11,2):
print(x) |
Repeats code a predefined number of times While LoopsRepeat until false
while True:
print("Hello There!")
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Using 'break' to end the loop
while True:
x = input("Say Yes")
if x == "Yes":
break
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Until x is more than 100
x = 0
while x < 100:
x = int(input("x ?")) |
A while loop will repeat infinitely until the program or user input tells it to stop
Repeats code until a condition is met [within the program] Creating And Using FilesCreate document myfile = open("Filename.txt","w") | Add data to the text file myfile.write("Hello World") | Reads entire file into one string myfile.read() | Reads first 4 characters into one string myfile.read(4) | Reads one line of a file myfile.readline() | Reads entire file into a list of strings, one per line myfile.readlines() | Steps through lines in a file for eachline in myfile: | Close the file myfile.close() |
("w" write, "r" read, "a" append)
.csv will create a spreadsheet | | Demonstrating knowledgeAnnotate / Comment on a line of code #short comments | Annotate / comment on a block of code '''for longer comments''' |
VariablesCreating a variable name = "Josh" | Length of string len(name) | Print a variable print(name) | Coverting [String↔Integer] str(age) 'or' int(age) |
All variables are strings [str] by default NumbersAddition 2+2 | Subtraction 4-1 | Multiplication 3*5 | Division 15/10 | To the power of... 1.5**2 | Multiplying A String "Ethan" *14 |
Numbers follow the BIDMAS / BODMAS rule Creating And Accessing ListsCreating a list mylist = ["Computer", "Science", 17] | Output full list print(mylist) | Access first item mylist[0] | Access first to second mylist[1:2} | Access third item to the end mylist[2:] | Access up to the third item mylist[:2] | Check for in list "Computer" in mylist | Concatenate mylist + ["a"] | Remove third item and use mylist.pop(2) | Remove last item and use mylist.pop() | Find position in the list mylist.index(Science) | Count appearances mylist.count(17) | Add values sum(mylist) | Length of List len(mylist) | Compare lists cmp(mylist, list) | Biggest number in list max(mylist) | Smallest number in list min(mylist) |
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