file_size = file.tell() # 获取文件大小 line_end = '' while file.tell() > 0: while file.tell() > 0 and line_end != '\n': file.seek(-2, 1) # 逐字符向前移动文件指针 line_end = file.read(1) line = file.readline().strip() line_end = '' yield line for line in reverse...
How to read a file in reverse order? import os def readlines_reverse(filename): with open(filename) as qfile: qfile.seek(0, os.SEEK_END) position = qfile.tell() line = '' while position >= 0: qfile.seek(position) next_char = qfile.read(1) if next_char == "\n": yield ...
在windows10, RAM 16G,处理器 11th Gen Intel(R) Core(TM) i5-11400 @ 2.60GHz 2.59 GHz , python 3.7.11 下简单验证, 读取220M,722万行 文本文件,按行转为列表,read_reverse_bigfile 耗时大概3.8s,内存774MB, file对象readlines()函数,正序读取同样文件耗时大概1.1s,内存552MB。 取最后200行内容,read_r...
[4] 在__init__.py中定义__all__ = [“echo”, “surround”, “reverse”],一个包下面的模板名称,则 from package import * 的时候就把这个列表中的所有名字作为包内容导入 [5] 如果模块sound.filters.vocoder 要使用包 sound.effects 中的模块 echo,使用绝对路径,写成 from sound.effects import echo,...
for k in sorted(wordcount, key=wordcount.get, reverse=True): print(k, wordcount[k]) 1. 在上面的代码示例中,我们循环遍历字典中的键并对它们进行排序。这样,就把最常见的词排在最上面。当然,如果用Python读取包含多个单词的文件、并像这样打印结果,这种操作就是不可行的。
#create_ip_file('ips.txt') def sorted_ip(filename,count=10): ips_dict = dict() with open(filename) as f: for ip in f: if ip in ips_dict: ips_dict[ip] += 1 else: ips_dict[ip] = 1 sorted_ip = sorted(ips_dict.items(), key= lambda x:x[1],reverse=True)[:count] ret...
sorted_word_cnt=sorted(word_cnt.items(),key=lambda kv:kv[1],reverse=True)returnsorted_word_cnt inFile='in.txt'ifnot os.path.exists(inFile):print(f'file {inFile} not exist')sys.exit()withopen(inFile,'r')asfin:text=fin.read()word_and_freq=parse(text)outFile='out.txt'withopen(outFi...
(reverse=True) return master_dir, slave_dir_list, usb_dirs @ops_conn_operation def file_exist_on_master(file_path='', ops_conn=None): home_dir, _, _ = get_home_path() if home_dir is None: logging.error("Failed to get the home directory.") return False if file_path.startswith...
文件示例如下:[FILE=in.txt] HELLO,everybody,123$%2w4,What's your name? [FILE=out.txt] hello,EVERYBODY,123$%2W4,wHAT'S YOUR NAME? 解答: # 打开输入文件 with open('in.txt', 'r') as input_file: input_text = input_file.read() ...
pickle.load(file, *, fix_imports=True, encoding="ASCII", errors="strict") 从文件中读取二进制字节流,将其反序列化为一个对象并返回。 pickle.loads(data, *, fix_imports=True, encoding="ASCII", errors="strict") 从data中读取二进制字节流,将其反序列化为一个对象并返回。