"""
python3 bytes().py
参考：https://blog.csdn.net/weixin_40283816/article/details/83591582
知识点：
1.str to bytes
str.encode() -> bytes
bytes(str, encoding="utf8") -> bytes
2. bytes -> str
str(bytes, encoding="utf8") -> str
bytes.decode() -> str
"""
# 1.
print("1.")
b = b"example" # bytes object
print('b:', b)
# b: b'example'
print(type(b))
# <class 'bytes'>
# 2.
print("2.")
s = "example" # str object
sb = bytes(s, encoding="utf8") # str to bytes
print("sb:", sb)
# sb: b'example'
print(type(sb))
# <class 'bytes'>
sb = str.encode(s) # str to bytes
print("sb:", sb)
# sb: b'example'
print(type(sb))
# <class 'bytes'>
# 3.
print("3.")
bs = str(b, encoding="utf8") # bytes to str
print("bs:", bs)
# bs: example
print(type(bs))
# <class 'str'>
bs = bytes.decode(b) # bytes to str
bs = b.decode()
print("bs:", bs)
# bs: example
print(type(bs))
# <class 'str'>
