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Data Types

Data Types. Integer 15 String HelloThere! Float/Real 15.625 Boolean Yes / No Char P. Strings. Greeting = ‘Hello World’ print (Greeting) Hello World Letter = Greeting[2] print (Letter) l. Strings Len Function. Use to find out length of string. Name = ‘Dave’

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Data Types

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  1. Data Types Integer 15 String HelloThere! Float/Real 15.625 Boolean Yes / No Char P

  2. Strings Greeting = ‘Hello World’ print (Greeting) Hello World Letter = Greeting[2] print (Letter) l

  3. Strings Len Function Use to find out length of string Name = ‘Dave’ len(Name) 4

  4. Strings converting data types To convert from one data type to another, python has some useful functions 23 #an integer Str(value) will convert a given value to a string. Str(23) # is now a string ‘23’ e.g.1. Age as an ordinary integer. Age = 15 print(Age – 2) 13 e.g.2. Age converted to a string Age = 15 print(str(Age) – 2) ERROR! # can’t take a number value away from a string!

  5. Strings converting data types e.g.4. Concatenate a string and integer Age = 15 Statement= ‘You are’ Statement + Age ERROR!!! …try Statement +str(Age) Statement15 Or better still Statement + ‘ ‘ +str(Age) You are 15

  6. converting data types We can also try converting to integer data type Age = ’99’ type(Age) <class ‘str’> …try Type(int(age)) <Class ‘int’> Obviously, you can’t convert ALL data to type integer! e.g Greeting = ‘Hello World’ Type(int(Greeting)) Error!!! #letters don’t correlate to a number!

  7. converting data types We can also try converting to integer data type to a Floating data type (i.e. a REAL number) Age = 99 type(Age) <class ‘int’> …try NewAge = float(Age) Print(NewAge) 99.0 e.g. Pi = 3.14 type(Pi) <class ‘float’>

  8. Prompting User for some Data We will use input() to grab some data from our end user. Age = input(‘What is your Age? ’) print(Age) ’99’ # note…this is a string Converting this into an integer can be done by…? Age = int(input(‘What is your Age? ’)) print(Age) 99 # note…this is a now an integer

  9. Prompting User for some Data • TASK • Prompt the user for 5 numbers. • Each number should be assigned an appropriate Variable name e.g. Num1, Num2 etc • After 5numbers have been entered, the sum of the numbers should be outputted as • ‘The sum of your 5 numbers is x’ • The final line should show the average of the 5 numbers, and should read like this • ‘The average of your 5 numbers is x’ • ((Think carefully about which data types to use in the Sum and Average calculations))

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