2025-09-10:仓库迁移

5.文件与IO/4.读写二进制数据.py

@@ -0,0 +1,43 @@
+from base64 import decode
+
+
+def write_bin_file(bin_path):
+    with open(bin_path, 'wb') as f:
+        f.write(b'Hello BinFile')
+
+
+if __name__ == "__main__":
+    path = "5.文件与IO/4.bin_file.bin"
+
+    write_bin_file(path)
+    # 如果想要打开二进制文件，那就需要做'rb'模式
+    with open(path, 'rb') as f:
+        print(f.read())
+
+    # 在打印的时候也有差异，要记得先utf-8转码，不然出来的是ascii
+    a = b'Hello BinFile'
+    for i in a:
+        print(i, end=' ')
+    print()
+
+    for i in a.decode('utf-8'):
+        print(i, end='')
+    print()
+
+    # C语言结构体和数组这种自带缓冲区接口的东西，可以直接读写文件，而不用先用encoder编码
+    import array
+    a = array.array('i', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
+    # 往文件里写array
+    with open(path, 'wb') as f:
+        f.write(a)
+
+    # 直接把bin array从文件里薅出来塞到b的缓冲区
+    b = array.array('i', [0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
+    with open(path, 'rb') as f:
+        f.readinto(b)
+
+    print(b)
+
+    # 但是这么干有风险，要谨慎应对
+
+