What are the six data types in python?

Python’s six data types are: Number, String, List, Tuple, Dictionary, and Set.

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python six A data type

• Number (number)
• String (string)
• List(List)
• Tuple(Tuple)
• Dictionary(Dictionary)
• Set (set)

##1.Numbers

'''

Multi-line comments: Three single quotes or three double quotes
Single line comment:
# a=1
print(a)
b=0.001
print(b)
c=-10
d=3
print(c/d,c//d,c%d,c**d)
e=1.23e10
f=1.23e-2
g=0x3f

Python's integers have no size limit, while integers in some languages ​​have size limits based on their storage length. For example, Java limits the range of 32-bit integers to -2147483648-2147483647.

Python's floating point numbers have no size limit, but if they exceed a certain range, they are directly expressed as inf (infinite) '''

2.String

print(
'''
床前明月光，
   疑是地上霜，
举头望明月，\n
低头思故乡。
''')

**Use this format to directly output multi-line string content, omitting \n **

print(
r'''
床前明月光，
   疑是地上霜，
举头望明月，\n
低头思故乡。
''')

Note that adding r before '''\n is also output as a character print('There is bright moonlight in front of the bed, it is suspected to be frost on the ground,\nLook up at the bright moon, bow your head and miss your hometown.')

print("The sun is over the mountains, the Yellow River flows into the sea,\tIf you want to see a thousand miles away, you can reach a higher level.")

\nEnter\tTab print(“I'm “OK”.”)

Note that the escape character “\” must be added in front of the symbol
Small exercise, speculation Output the results and verify print(''Hello,world'')
print(r"'Hello,'Adam''")
print("r'Hello, "Bart"' ”)
print('''r'''Hello,
Lisa!'''''')

Use the operator to combine multiple characters String, or multiple variables, or variables and strings are connected, * means repetition; two adjacent strings can be automatically connected to facilitate the display of long sentences

name='baby'
behavior='love '
print('I'+2*behavior+'you,'+name)
print('Grow old along with me,'
'the best day is to be.')

**You can also

index and slice the string. Pay attention to the boundary of the slice, including the front but not the back**

valustring='python'
print( 
          ' valustring[0] = ' + valustring[0],
		  'valustring[-1] = ' + valustring[-1],
		  'valustring[:2] = ' + valustring[:2],
		  'valustring[2:]+valustring[:2]='+valustring[2:]+valustring[:2]
		  
      )

Strings are immutable. An error will occur when assigning a value to a certain index position of a string variable. If you need a different string, you should create a new one

word = 'immortal'
word[0]='P'
print(word[0])#错误！
print(len(word))

The built-in function len() returns the number of characters in the string, not the number of bytes!

Boolean value: True False (the first letter must be capitalized) Related operations: or and (and) not

Empty value: None (note Writing method, not null), None cannot be understood as "0"

Variable: Python is a dynamically typed language, variables in python can be of any type, the corresponding is

" "Static type language" - the type must be declared before the variable is used, and the assignment type must be consistent with the declared type. This is true for Java, C, and C.
How are variables represented in computer memory?
a='hello, world' First, the computer creates the string 'hello, world' in the memory, then creates a variable a in the string, and points a to the string 'hello, world';
a=b actually points b to the data pointed to by a, rather than to a itself.

List

List is an ordered collection, the types of elements can be different, and lists can be nested

L = [
    ['Apple', 'Google', 'Microsoft'],
    ['Java', 'Python', 'Ruby', 'PHP'],
    ['Adam', 'Bart', 'Lisa']，3.14,'honglin'
]
print(L[0][3],L[1][1],L[2][0]),L[-1]);

Just like strings, lists can be indexed and sliced, but The difference is that an error will be reported for an index list out of range, and the string will default to the largest index value; slicing the list will return a new list, not just the sliced ​​value

You can use to merge two lists

table=[2,4,6]
print(table + [1,3,5])

Unlike immutable strings, lists are mutable, which allows modification of elements:

cubes=[1,8,27,65,125]
cubes[3] = 64
print(cubes)
cubes.append(6**3)
cubes.append(7**3)
print(cubes)
cubes[:2] = []
print(cubes)
len(cubes)

You can use the append() method to add new elements to the end of the list:

You can also assign values ​​to slices. This operation can change the size of the list, or Clear it:

The built-in function len() also applies to lists

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