在本节,我们将反编译 for 循环并逐步说明解释器在执行 for 循环时的指令。这里使用dis模块来反编译 for 循环。详细来说,就是我们将使用 dis.dis 方法来生成可读性更高的字节码。 我们会使用之前一直用的简单 for 循环示例。接下来将文件写入文件 for_loop.py。 我们可以调用 dis.dis 方法获得可读性高的字节码。
In the example, we read the contents of the file with readlines. We print the list of the lines and then loop over the list with a for statement. $ ./read_lines.py ['Lost Illusions\n', 'Beatrix\n', 'Honorine\n', 'The firm of Nucingen\n', 'Old Goriot\n', 'Colonel Chabert\...
When we want to read from or write to a file, we need to open it first. When we are done, it needs to be closed so that the resources that are tied with the file are freed. 方法1: 方法2: 方法3: We can read a file line-by-line using afor loop. This is both efficient and ...
deffetch_url(url):response=requests.get(url)print(f'获取 {url} 的响应: {response.status_code}')urls=['https://www.example.com','https://www.python.org','https://www.github.com']threads=[]forurlinurls:thread=threading.Thread(target=fetch_url,args=(url,))threads.append(thread)thread....
loop over the list of csv files for f in csv_files: # read the csv file df...
# TODO: Write out the header for the quiz. # TODO: Shuffle the order of the states. # TODO: Loop through all 50 states, making a question for each. 因为这个程序会随机排序问题和答案,你需要导入random模块➊ 来使用它的函数。capitals变量➋ 包含一个字典,以美国各州为键,以它们的首都为值。
data=f.read() #loop整个文档 with open('somefile.txt','r')asf:forlineinf: #处理没一行的数据 #写入文本 with open('somefile.txt','w')asf: f.write(text1) f.write(text2) ... #把要打印的line写入文件中 with open('somefile.txt','w')asf: print...
pd.read_csv(file_directory)if __name__=='__main__':loop_directory('data/')data/data3.csv data/data2.csv data/data1.csv 对上面脚本的解释如下：· for filename in os.listdir(directory) : 在一个指定的目录中遍历文件。· if filename.endswith(".csv") :运行（访问？）以‘.csv’ 结尾...
loop over the list of csv files for f in csv_files: # read the csv file df...
import osimport pandasaspddefloop_directory(directory:str):'''Loop files in thedirectory'''forfilenameinos.listdir(directory):if filename.endswith(".csv"):file_directory = os.path.join(directory,filename)print(file_directory)pd.read_csv(file_directory)if __name__=='__main__':loop_directo...