Learn Python from scratch-Data Type string, python-Data Type

Learn Python from scratch-Data Type string, python-Data Type

I,PythonData Type in

· Integer, for example, 1-100

· Long integer, which is a relatively large integer. Python 2 contains long integers; Python 3 does not

· Floating point numbers such as 1.23 and 3E-2

· Boolean type False True

II,Number(Number)Three Types:

·IntInteger

2) FloatBy default, 17 decimal places are retained, and the length will be lost.

For example: 0.0000000000000000000000000000000001

Display: 1e-37 = 1*10 to the power of 37

3) Bool Boolean Type

For example:

Num01= 100

IfNum01> 10:

Print ("This ratio10Large")

Else:

Print ("This ratio10Small")

# "Big" means "True", "small" means "False ".

 

Save characters

Str01 ="Www.iLync.cn"

Print (str01)

Print (str01 [0: 4])

 

The following is a wavy line, indicating that it is not a word that actually exists.

How to obtain the data type of a variable?

Print (type (num01) s's

Type: obtains the Data type of a variable.

Determines whether a variable belongs to a certain data type.

Isinstance () function to determine whether an object is of a known type, similar to type ().

IfIsinstance (str01, (str )):

Print ("string ")

 

Extended content:

Example:

Str01 ="Abcdefghijklmn"

#Print second digit

Print (str01 [1])

Print (str01 [-len (str01) + 1])

#Print second to last

Print (str01 [-2])

Print (str01 [len (str01)-2])

#Print a range

Print (str01 [5: 10])

Print (str01 [2: 5])

 

#Reverse Order

Print (str01 [:-1])

 

#Print2Times

Print (str01 * 2)

 

#Print each character3Times

List01 = []

I = 0

WhileI <len (str01 ):

Print (str01 [I] * 3, end ="")

I + = 1

 

#Enter a number (for example10), Generate10Items100If the number is less than the value, the average value, the maximum value, and the minimum value are used.

ImportRandom

Num = int (input ("Enter a number:"))

I = 0; current_num = 0; sum = 0

List01 = []

 

WhileI <num:

Current_num = random. randint (0,100 );

Sum + = current_num

List01.append (current_num)

I + = 1

Print (list01)

Print ("Average:% D"% (Sum/num ))

Print ("Maximum:% D"% Max (list01 ))

Print ("Minimum:% D"% Min (list01 ))

 

#Input a number into uppercase letters

Num = input ("Enter a number:")

Tuple01 = ("Zero","Yi","II.","Parameter","Si","Wu","Lu","Bytes","Bytes","Bytes")

I = 0

WhileI <len (num ):

Print (tuple01 [int (num [I])], end ="")

I + = 1