Conversion of common data types in python3

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Python3 Conversion of common data types

One 、 Conversion of data types , You just need to use the data type as the function name

Python3 Built in function data type conversion is commonly used in

function

explain

int(x [,base ])

take x Convert to an integer （x Is a string or number ,base Hexadecimal number , Default decimal Floating point to integer ）

long(x [,base ])

take x Convert to a long integer

float(x )

take x Converts to a floating point number

complex(real [,imag ])

Create a complex number

str(x )

Put the object x Convert to string

repr(x )

Put the object x Converts to an expression string

eval(str )

Used to calculate the validity in a string Python expression , And returns an object

tuple(s )

The sequence of s Converts to a tuple

list(s )

The sequence of s Convert to a list

chr(x )

Converts an integer to a character

unichr(x )

Convert an integer to Unicode character

ord(x )

Converts a character to its integer value

hex(x )

Convert an integer to a hexadecimal string

oct(x )

Converts an integer to an octal string

The whole type 4 Forms of expression

• 2 Base number ： With '0b' start . for example ：'0b11011' Express 10 It's binary 27
• 8 Base number ： With '0o' start . for example ：'0o33' Express 10 It's binary 27
• 10 Base number ： Normal display
• 16 Base number ： With '0x' start . for example ：'0x1b' Express 10 It's binary 27

4 The conversion of Radix to radix ： adopt python Built in functions in （bin、oct、int、hex） To implement the transformation

Two 、 list 、 Tuples 、 aggregate 、 Dictionaries transform each other

1、 List tuple to other

List to set ( duplicate removal )

list1 = [6, 7, 7, 8, 8, 9]
print(set(list1))
Python3 result ：{6, 7, 8, 9}

Two lists go to the dictionary

list1 = ['key1','key2','key3']
list2 = ['1','2','3']
print(dict(zip(list1,list2)))
Python3 result ：{'key1': '1', 'key2': '2', 'key3': '3'}

Nested list to dictionary

list3 = [['key1','value1'],['key2','value2'],['key3','value3']]
print(dict(list3))
Python3 result ：{'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}

list 、 Tuple to string

list2 = ['a', 'a', 'b']
print(''.join(list2))
Python3 result ：aab
tup1 = ('a', 'a', 'b')
print(''.join(tup1))
Python3 result ：aab

2、 Dictionary to others

Dictionary to string

dic1 = {'a':1,'b':2}
print(str(dic1))
Python3 result ：{'a': 1, 'b': 2} 

Dictionaries key and value Interturn

dic2 = {'a': 1, 'b': 2, 'c': 3}
print({value:key for key, value in dic2.items()})
Python3 result ：{1: 'a', 2: 'b', 3: 'c'}

3、 String to other

String to list

s = 'aabbcc'
print(list(s))
Python3 result ：['a', 'a', 'b', 'b', 'c', 'c']

String to tuple

print(tuple(s))
Python3 result ： ('a', 'a', 'b', 'b', 'c', 'c')

String conversion

print(set(s))
Python3 result ：{'a', 'b', 'c'}

String to dictionary

s = "{'name':'Tom', 'age':18}"
dic2 = eval(s)
print(dic2)
Python3 result ：{'name': 'Tom', 'age': 18}
a = '{"name":"Rose","age":19}'
print(eval(a))
Python3 result ：{'name': 'Rose', 'age': 19}

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