安装python性能检测工具line_profiler

line_profiler是一款监测python的CPU密集型性能问题的强大工具，可以对函数进行逐行分析，在linux上安装时一切正常，然而今天在win10 64位系统安装失败了

pip3 install line_profiler

报错：

error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools

提示我需要安装 Microsoft Visual C++ 14.0

解决办法：

wheel是一个已经编译好的包，在安装时不需要编译过程，安装whl文件时要比发布的源文件安装要快，目前大部分python包都有wheel包，推荐使用wheel方式安装

从https://www.lfd.uci.edu/~gohlke/pythonlibs/网站找到line_profiler，找到对应的python版本，实测python3.6.4下win_32版本安装不成功，使用win_amd64能成功安装

简单测试：

kernprof -l -v tr1y.py

正常输出如下：

(1.800000000000033, -1.800000000000033)
length of x: 1000
total elements: 1000000
Wrote profile results to tr1y.py.lprof
Timer unit: 5.68888e-07 s

Total time: 2.84954 s
File: tr1y.py
Function: calculate_z_serial_purepython at line 48

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
    48                                           @profile
    49                                           def calculate_z_serial_purepython(max_iter, zs, cs):
    50         1       7062.0   7062.0      0.1      output = [0] * len(zs)
    51   1000001     564275.0      0.6     11.3      for i in range(len(zs)):
    52   1000000     553309.0      0.6     11.0          n = 0
    53   1000000     632514.0      0.6     12.6          z = zs[i]
    54   1000000     593978.0      0.6     11.9          c = cs[i]
    55   1485000    1365751.0      0.9     27.3          while abs(z) < 2 and n < max_iter:
    56    485000     344250.0      0.7      6.9              z = z * z + c
    57    485000     310470.0      0.6      6.2              n += 1
    58   1000000     637342.0      0.6     12.7          output[i] = n
    59         1          3.0      3.0      0.0      return output