从…开始
img_data = 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使用base64编解码器解码数据，然后将其写入文件系统。
# In Python 2.7
fh = open("imageToSave.png", "wb")
fh.write(img_data.decode('base64'))
fh.close()
# or, more concisely using with statement
with open("imageToSave.png", "wb") as fh:
fh.write(img_data.decode('base64'))
将该示例更新为Python 3，该Python 3从字符串/字节.encode()和.decode()函数中删除了对任意编解码器的支持：
# For both Python 2.7 and Python 3.x
import base64
with open("imageToSave.png", "wb") as fh:
fh.write(base64.decodebytes(img_data))
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