print "here is :",__file__,sys._getframe().f_lineno=> this is dedicated for output with filename and line number. another way to represent line number instead of using function method.
# 导入xlwings模块import xlwings as xw# 打开Excel程序,默认设置:程序可见,只打开不新建工作薄,屏幕更新关闭app=xw.App(visible=True,add_book=False) app.display_alerts=False app.screen_updating=False# 文件位置:filepath,打开test文档,然后保存,关闭,结束程序filepath=r'g:\Python Scripts\test.xlsx' wb=a...
created = tz.localize(dt.fromtimestamp(os.path.getctime(dest_file))) modified = tz.localize(dt.fromtimestamp(os.path.getmtime(dest_file))) accessed = tz.localize(dt.fromtimestamp(os.path.getatime(dest_file)))print("\nDestination\n===")print("Created: {}\nModified: {}\nAccessed: {...
for line in open(thefilepath): count += 1 However,xreadlinesdoes not return a sequence, and neither does a loop directly on the file object, so you can’t just uselenin these cases to get the number of lines. Rather, you have to loop and count line by line, as shown in the solu...
for number in count_up_to(5): print(number)2.3 yield与迭代协议的关系 2.3.1 迭代器协议概述 迭代器协议是Python中一系列规则的集合 ,任何遵循这些规则的对象都可被视为迭代器。主要涉及__iter__()方法(返回迭代器自身)和__next__()方法(返回下一个值或引发StopIteration)。
File "E:/python基础/demo.py", line 4, in <module> print(1 / 0) ZeroDivisionError: division by zero 七、序列化和反序列化 通过文件操作,我们可以将字符串写入到一个本地文件。但是,如果是一个对象(例如列表、字典、元组等),就无法直接写入到一个文件里,需要对这个对象进行序列化,然后才能写入到文件里...
for line in file_object: print(line.rstrip().replace('Python','C')) print() with open('learning_python.txt') as file_object: lines = file_object.readlines() file_str = '' for line in lines: file_str += line.replace('Python','C') ...
file = open(r'C:\Users\chris\Desktop\Python基础\xxx.txt') '/'(推荐) file = open('C:/Users/chris/Desktop/Python基础/xxx.txt') 常用文件的访问模式 1. 打开文件的模式有(默认为文本模式): r 只读模式【默认模式,文件必须存在,不存在则抛出异常】 ...
filename = 'pi_digits.txt' with open(filename) as file_object: lines = file_object.readlines() pi_string = "" for line in lines: pi_string += line.strip() print(pi_string) print(len(pi_string)) 执行结果如下: 简单实例——在圆周率中寻找你的生日 读取圆周率前一百万位,在其中判断是否...
readline() Traceback (most recent call last): File "<stdin>", line 1, in <module> IOError: File not open for reading read(), readline()以及readlines()是学习open()函数里的重点内容,三者的用法和差异很大,其中readlines()更是重中之重(原因后文会讲到),网工必须熟练掌握。下面一一讲解: read(...