1 namesList = ['a','b','c'] 比C语言的数组强大的地方在于列表中的元素可以是不同类型的 1 testList = [1, 'a'] 2.列表的循环遍历 使用for循环 1 2 3 namesList = ['xiaoWang','xiaoZhang','xiaoHua'] for name in namesList: print(name) 使用while循环 1 2 3 4 5 6 7 8 9 name...
PEP 238: An expression like1/2returns a float. Use1//2to get the truncating behavior. (The latter syntax has existed for years, at least since Python 2.2.) Thesys.maxintconstant was removed, since there is no longer a limit to the value of integers. However,sys.maxsizecan be used ...
PEP 238: An expression like1/2returns a float. Use1//2to get the truncating behavior. (The latter syntax has existed for years, at least since Python 2.2.) Thesys.maxintconstant was removed, since there is no longer a limit to the value of integers. However,sys.maxsizecan be used ...
Keyword arguments are allowed after the list of base classes in a class definition. This is used by the new convention for specifying a metaclass (see next section), but can be used for other purposes as well, as long as the metaclass supports it. PEP 3104: nonlocal statement. Using non...
["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) 4 obj.stdin.write('print 1 \n ') 5 obj.stdin.write('print 2 \n ') 6 obj.stdin.write('print 3 \n ') 7 obj.stdin.write('print 4 \n ') 8 9 out_error_list = obj.communicate() 10 print out...
PEP 238: An expression like1/2returns a float. Use1//2to get the truncating behavior. (The latter syntax has existed for years, at least since Python 2.2.) Thesys.maxintconstant was removed, since there is no longer a limit to the value of integers. However,sys.maxsizecan be used ...
out_error_list = obj.communicate('print "hello"') print out_error_list 更多猛击这里 六、shutil 高级的 文件、文件夹、压缩包 处理模块 shutil.copyfileobj(fsrc, fdst[, length]) 将文件内容拷贝到另一个文件中,可以部分内容 def copyfileobj(fsrc, fdst, length=16*1024): ...
Example 2Here, we are truncating a negative floating-point number "-10.9" using the math.trunc() method −Open Compiler import math result = math.trunc(-10.9) print("The result obtained is:",result) OutputFollowing is the output of the above code −...
This mode allows you to safely append new member files to a ZIP archive without truncating its current content: Python >>> import zipfile >>> def append_member(zip_file, member): ... with zipfile.ZipFile(zip_file, mode="a") as archive: ... archive.write(member) ... >>> ...
print(line) ''' 上面两种读文件方式结果: ['10 1 9 9\n', '6 3 2 8\n', '20 10 3 23\n', '1 4 1 10\n', '10 8 6 3\n', '10 2 1 6\n'] 结论: 可以看到,我们可以对文件迭代器执行和普通迭代器相同的操作,比如上面使用 list(open(filename)) 将 f 转为一个字符串列表,这样所...