在 Windows 下安裝 python line_profiler 的方式

採用下列指令安裝，會需要有 Visual Studio 才能夠順利安裝:

$ pip install line_profiler

可到 Unofficial Windows Binaries for Python Extension Packages 搜尋 line_profiler，下載對應版本的 .whl。

然後以下列指令安裝 (for Python 3.7):

$ pip install line_profiler‑3.0.2‑cp37‑cp37m‑win_amd64.whl
.
.
.
Successfully installed line-profiler-3.0.2

試著跑跑看:

$ ipython
In[1]: def sum_of_lists(N):
           total = 0
           for i in range(5):
               L = [j ^ (j >> i) for j in range(N)]
               total += sum(L)
           return total

In[2]: %load_ext line_profiler

In[3]: %lprun -f sum_of_lists sum_of_lists(5000)

Timer unit: 1e-07 s

Total time: 0.0130998 s
File: 
Function: sum_of_lists at line 1

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     1                                           def sum_of_lists(N):
     2         1         21.0     21.0      0.0             total = 0
     3         6        102.0     17.0      0.1             for i in range(5):
     4         5     126352.0  25270.4     96.5                 L = [j ^ (j >> i) for j in range(N)]
     5         5       4515.0    903.0      3.4                 total += sum(L)
     6         1          8.0      8.0      0.0             return total

參考資料

[書籍] Python Data Science Handbook, Jake VanderPlas