[英]Python converting from base64 to binary
我有一個關於將base64編碼的字符串轉換為二進制的問題。 我在以下鏈接中收集Fingerprint2D,
url = "https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/108770/property/Fingerprint2D/xml"
Fingerprint2D=AAADccB6OAAAAAAAAAAAAAAAAAAAAAAAAAA8WIEAAAAAAACxAAAAHgAACAAADAzBmAQwzoMABgCI AiTSSACCCAAhIAAAiAEMTMgMJibMsZuGeijn4BnI+YeQ0OMOKAACAgAKAABQAAQEABQAAAAAAAAA AA==
Pubchem中的說明說這是115個字節的字符串,轉換為二進制時應為920位。 我嘗試使用以下方法將其轉換為二進制文件,
response = requests.get(url)
tree = ET.fromstring(response.text)
for el in tree[0]:
if "Fingerprint2D" in el.tag:
fpp = bin(int(el.text, 16))
print(len(fpp))
如果使用上面的代碼,則會出現以下錯誤,“值錯誤:base16的int()的無效文字:
如果我使用下面的代碼,則fpp(二進制)的長度等於1278,這不是我期望的。
response = requests.get(url)
tree = ET.fromstring(response.text)
for el in tree[0]:
if "Fingerprint2D" in el.tag:
fpp = bin(int(hexlify(el.text), 16))
print(len(fpp))
非常感謝!
要解碼base64格式,您需要將bytes
對象傳遞給base64.decodebytes
函數:
import base64
t = "AAADccB6OAAAAAAAAAAAAAAAAAAAAAAAAAA8WIEAAAAAAACxAAAAHgAACAAADAzBmAQwzoMABgCI AiTSSACCCAAhIAAAiAEMTMgMJibMsZuGeijn4BnI+YeQ0OMOKAACAgAKAABQAAQEABQAAAAAAAAA AA==".encode("ascii")
decoded = base64.decodebytes(t)
print(decoded)
print(len(decoded)*8)
我得到以下內容:
b'\x00\x00\x03q\xc0z8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00<X\x81\x00\x00\x00\x00\x00\x00\xb1\x00\x00\x00\x1e\x00\x00\x08\x00\x00\x0c\x0c\xc1\x98\x040\xce\x83\x00\x06\x00\x88\x02$\xd2H\x00\x82\x08\x00! \x00\x00\x88\x01\x0cL\xc8\x0c&&\xcc\xb1\x9b\x86z(\xe7\xe0\x19\xc8\xf9\x87\x90\xd0\xe3\x0e(\x00\x02\x02\x00\n\x00\x00P\x00\x04\x04\x00\x14\x00\x00\x00\x00\x00\x00\x00\x00'
920
因此920位符合預期。
要獲取數據的二進制只是重復的字節,並使用轉換為二進制format
和零填充至8位數字( bin
增加了一個0b
頭,所以它不是合適的),並join
串在一起:
print("".join(["{:08b}".format(x) for x in decoded]))
結果是:
00000000000000000000001101110001110000000111101000111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011110001011000100000010000000000000000000000000000000000000000000000001011000100000000000000000000000000011110000000000000000000001000000000000000000000001100000011001100000110011000000001000011000011001110100000110000000000000110000000001000100000000010001001001101001001001000000000001000001000001000000000000010000100100000000000000000000010001000000000010000110001001100110010000000110000100110001001101100110010110001100110111000011001111010001010001110011111100000000110011100100011111001100001111001000011010000111000110000111000101000000000000000001000000010000000000000101000000000000000000101000000000000000001000000010000000000000101000000000000000000000000000000000000000000000000000000000000000000
(按預期,為920個字符)
python 3最簡單的方法是:
import base64
base64.b64decode(base64_to_binary_input)
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