Pyqt5 learning pit encounter and pit drainage (1) unable to open designer.exe

One 、 stay 《Pyqt5 Rapid development and actual combat 》 In a Book , See the use of qt designer Interface design is faster , Just follow the above method , But trying to open designer.exe There was an error in the program , The lack of ×××.dll.
Two 、 I found the corresponding method on the Internet , The reason might be pyqt5 Version and pyqt5-tools Caused by the problem of inconsistent versions , Based on others' experience , The following two versions can be paired ：

pyqt5==5.8
pyqt5-tools==5.9.2.1.4rc0

3、 ... and ： Uninstall the original version , And download the above version , Can open designer.exe. But there are new problems , Error reported, module not found sip, After finding many ways , Found again sip and pyqt5 The version of does not match .
Four ： Although the corresponding version of the official standard configuration is not found , After trying once , Find the version available ：

sip==4.19.7

5、 ... and ： Perfect solution

notes ： If downloading the library is too slow , The following image sources are available ：

pip install PyQt5 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

among PyQt5 Change to the corresponding database name .