file-like Object:像open()函数返回的这种有个read()方法的对象,在Python中统称为file-like Object。除了file外,还可以是内存的字节流,网络流,自定义流等等。file-like Object不要求从特定类继承,只要写个read()方法就行。 StringIO就是在内存中创建的file-like Object,常用作临时缓冲。 • 写文件 调用open( ...
file_path='example.txt'withopen(file_path,'r')asfile:# 执行文件操作,例如读取文件内容 file_content=file.read()print(file_content)# 文件在with块结束后会自动关闭,无需显式关闭文件 在上述示例中: •'example.txt'是文件的路径和名称,你可以根据实际情况修改为你想要打开的文件。 •'r'表示只读模式。
取最后200行内容,read_reverse_bigfile 结果转列表,耗时大概0.8s,占用内存约12MB,file对象readlines()函数 ,列表切片,1.1s,内存约552MB。 import re def read_reverse_bigfile(filepath, encoding='utf-8', separator=b'\n', single_size=1024 * 1024): """ :param filepath: 文件路径 :param encoding: ...
dst_file=input('源文件路径>>: ').strip()withopen(r'{}'.format(src_file),mode='rt',encoding='utf-8')asf1,\open(r'{}'.format(dst_file),mode='wt',encoding='utf-8')asf2: res=f1.read() f2.write(res) a:只追加写,在文件不存在时会创建空文档,在文件存在时文件指针会直接调到末尾...
EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null) FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. urandom_read: 4 callbacks suppressed random: dd: uninitialized urandom read (512 bytes read) ...
(ops_conn=None): """ Get the full filename of the home directory """ uri = '{}'.format('/restconf/data/huawei-file-operation:file-operation/disk-usages') req_data = None ret, _, rsp_data = ops_conn.get(uri, req_data) if ops_return_result(ret) or rsp_data == '': ...
pandas 包read_csv 函数,参数有 38 个之多,功能非常强大。 关于单机处理大文件,read_csv 的chunksize 参数能做到,设置为 5, 意味着一次读取 5 行。 def pandas_read(filename,sep=',',chunksize=5): reader = pd.read_csv(filename,sep,chunksize=chunksize) while True: try: yield reader.get_chunk()...
:print(f"[-] delete {full_filename}")elifaction==FILE_MODIFIED:print(f"[*] modify {full_filename}")try:print("[vvv] dumping contents ...")withopen(full_filename)asf:contents=f.read()print(contents)print("[^^^] dump complete")exceptExceptionase:print("[!!!] dump failed. {e}"...
{'mac':'', 'esn':''} g_ip_addr = None # File server in which stores the necessary system software, configuration and patch files: # 1) Specify the file server which supports the following format. # (hostname for IPv6 should be placed in brackets) # tftp://hostname # ftp://...
Makefile Allow to test python-build separately Sep 19, 2022 README.md README: Add recommended curl arguments to suggested installer invocat… Jan 5, 2025 install_local_python.gif Add quick start section and gif demo to accompany it. (#3044) ...