Win7 DOS window resolves fatal error in launcher:unable to create process using ' "

When the extended binary package of the Python3 is installed under 64-bit Win7, the fatal error in the launcher:unable to create process using ' "error is encountered.

Make a note of the solution. Take the installation NumPy as an example.

1. Download from http://www.lfd.uci.edu/~gohlke/pythonlibs/: NUMPY-1.13.3+MKL-CP36-CP36M-WIN_AMD64.WHL

2. Copy it to the Scripts of the Python3 installation file, for example: D:\DevelopSoft\Python\python3\python3\Scripts

3. Use cmd command to enter the DOS window, input: Pip install d:\developsoft\python\python3\python3\scripts\numpy-1.13.3+

MKL-CP36-CP36M-WIN_AMD64.WHL fatal error in launcher:unable to create process using ' "' ERROR hint

4. Replace the above order with the following: python3-m pip install d:\developsoft\python\python3\python3\scripts\numpy-1.13.3+mkl-

CP36-CP36M-WIN_AMD64.WHL can succeed (because I have both Python2 and Python3 installed, so the interpreter is written as Python3).

5. View the list of expanded packages that have been installed: python3-m PIP list