为了读取数据到一个可变数组中,使用文件对象的readinto()方法。比如: import os.path def read_into_buffer(filename): buf = bytearray(os.path.getsize(filename)) with open(filename, 'rb') as f: f.readinto(buf) return buf 下面是一个演示这个函数使用
Now that we have learned how to use the string constructor of the ByteArray class, next, let us have a look at how you can convert an object of the Bytes class into ByteArray class. Converting Bytes into ByteArray Let’s assume you are working with a read-only image and you wish to...
('example.zip', 'rb') as f: zip_data = f.read() # 将 zip 数据转换为 bytea bytea_data = psycopg2.Binary(zip_data) # 插入数据到数据库 cur.execute("INSERT INTO files (name, content) VALUES (%s, %s)", ('example.zip', bytea_data)) conn.commit() # 关闭连接 cur.clo...
f.write(struct.pack("<20s", byte_array_value)) f.close() # 打开文件 withopen("binary_file.bin","rb") as f: # 读取4个字节,解析成一个整数 int_value = struct.unpack("<i", f.read(4))[0] # 读取8个字节,解析成一个双精度浮点数 double_value = struct.unpack("<d", f.read(8)...
import os.path def read_into_buffer(filename): buf = bytearray(os.path.getsize(filename)) with open(filename, 'rb') as f: f.readinto(buf) return buf 1. 2. 3. 4. 5. 6. 7.3>按行输出打印 >>> f.seek(0,0) 0 >>> for each_line in f: print(each_line) 1. 2. 3. 4...
1 record_size = 32 2 3 buf = bytearray(record_size) 4 5 with open('somefile', 'rb') as f: 6 7 while True: 8 9 n = f.readinto(buf) 10 11 if n < record_size: 12 13 break 14 15 16 17 另外有一个有趣特性就是 memoryview ,它可以通过零复制的方式对已存在的缓冲 18 19 区...
(img_gray,180,255,cv2.THRESH_BINARY) # 图像 OCR 识别 text = reader.readtext(img_thresh, detail=0, batch_size=10) result_dic = information_filter(filename, img_np, "".join(text)) return result_dic # Flask 路由 - 首页 @app.route('/') @app.route('/index') def Index(): return...
from datetime import time t = time(12,13,14) print (t) import dmPython conn = dmPython.connect('SYSDBA/Dmsys_123') cursor = conn.cursor() cursor.execute("create table test_time(c1 time)") cursor.execute("insert into test_time values(?)", t) Seq_params = [(t,), (t,)] curso...
importastimportsysimportosdefverify_secure(m):forxinast.walk(m):matchtype(x):case (ast.Import|ast.ImportFrom|ast.Call):print(f"ERROR: Banned statement{x}")returnFalsereturnTrueabspath = os.path.abspath(__file__)dname = os.path.dirname(abspath)os.chdir(dname)print("-- Please enter code...
MicroPython can execute scripts in textual source form (.py files) or from precompiled bytecode (.mpy files), in both cases either from an on-device filesystem or "frozen" into the MicroPython executable. MicroPython also provides a set of MicroPython-specific modules to access hardware-specific...