1、字符串轉bytes

方式一：
''' string to bytes eg:

'0123456789ABCDEF0123456789ABCDEF' b'0123456789ABCDEF0123456789ABCDEF' '''

def stringTobytes(str):  
    return bytes(str,encoding='utf8')

方式二：
def stringTobytes(str):  
    b=str.encode('utf-8')
    print(b)

2、bytes轉字符串

# bytes轉字符串方式一
''' bytes to string eg:

b'0123456789ABCDEF0123456789ABCDEF'

'0123456789ABCDEF0123456789ABCDEF' '''

def bytesToString(bs): 
     return bytes.decode(bs,encoding='utf8')

# bytes轉字符串方式二

b=b'\xe9\x80\x86\xe7\x81\xab'

string=str(b,'utf-8')

print(string)

 

# bytes轉字符串方式三

b=b'\xe9\x80\x86\xe7\x81\xab'

string=b.decode() # 第一參數默認utf8，第二參數默認strict

print(string)

 

# bytes轉字符串方式四

b=b'\xe9\x80\x86\xe7\x81haha\xab'

string=b.decode('utf-8','ignore') # 忽略非法字符，用strict會拋出異常

print(string)

 

# bytes轉字符串方式五

b=b'\xe9\x80\x86\xe7\x81haha\xab'

string=b.decode('utf-8','replace') # 用？取代非法字符

print(string)

3、十六進制字符串轉bytes

''' hex string to bytes eg:

'01 23 45 67 89 AB CD EF 01 23 45 67 89 AB CD EF'

b'\x01#Eg\x89\xab\xcd\xef\x01#Eg\x89\xab\xcd\xef' '''

def hexStringTobytes(str): 
    str = str.replace(" ", "")
     return bytes.fromhex(str)
     # return a2b_hex(str)

4、bytes轉十六進制字符串

'''
bytes to hex string 
eg:
b'\x01#Eg\x89\xab\xcd\xef\x01#Eg\x89\xab\xcd\xef'
'01 23 45 67 89 AB CD EF 01 23 45 67 89 AB CD EF'
'''
def bytesToHexString(bs):
    # hex_str = ''
    # for item in bs:
    #     hex_str += str(hex(item))[2:].zfill(2).upper() + " "
    # return hex_str
    return ''.join(['%02X ' % b for b in bs])

5.字符串轉列表

str1 = "hi hello world"

print(str1.split(" ")) 輸出： ['hi', 'hello', 'world']

6.列表轉字符串

l = ["hi","hello","world"]

print(" ".join(l)) 輸出： hi hello world

 7.十進制和十六進制相互轉換

    7.1十進制 、十六進制轉換   

10進制轉16進制: hex(16)  ==>  0x10
16進制轉10進制: int('0x10', 16)  ==>  16
類似的還有oct()， bin()

  7.2 字符串轉整數:

10進制字符串: int('10')  ==>  10
16進制字符串: int('10', 16)  ==>  16
16進制字符串: int('0x10', 16)  ==>  16