尝试在计算机上安装Django时遇到奇怪的错误。 这是我在命令行中键入的序列: C:\Python34>python get-pip.py Requirement already up-to-date: pip in c:\python34\lib\site-packages Cleaning up... C:\Python34>pip install Django 'pip' is not recognized as an internal or external command, operable program or batch file. C:\Python34>lib\site-packages\pip install Django 'lib\site-packages\pip' is not recognized as an internal or external command, operable program or batch file. 是什么原因造成的? 编辑_______________________ …
我正在创建一个读取文件的程序,如果文件的第一行不是空白,它将读取接下来的四行。在这些行上执行计算,然后读取下一行。如果该行不为空,则继续。但是,我收到此错误: ValueError: invalid literal for int() with base 10: ''. 它正在读取第一行,但无法将其转换为整数。 我该怎么做才能解决这个问题? 编码: file_to_read = raw_input("Enter file name of tests (empty string to end program):") try: infile = open(file_to_read, 'r') while file_to_read != " ": file_to_write = raw_input("Enter output file name (.csv will be appended to it):") file_to_write = file_to_write …