列表包TypeError：'浮动对象不可迭代'

Question

我有以下程序，它使用我从网上复制的双端机。

from collections import Counter,deque 
import re 
import time 
import my_ds 

num = 100000 

def append(c): 
    for i in range(num): 
     c.append(i) 

def appendleft(c): 
    if isinstance(c, deque): 
     for i in range(num): 
      c.appendleft(i) 
    else: 
     for i in range(num): 
      c.insert(0,i) 

def pop(c): 
    for i in range(num): 
     c.pop() 

def popleft(c): 
    if isinstance(c,deque): 
     for i in range(num): 
      c.popleft() 
    else: 
     for i in range(num): 
      c.pop(0) 


for container in [deque, list]: 
    for operation in [append, appendleft, pop, popleft]: 
     c = container(range(num)) 
     start = time.time() 
     operation(c) 
     elapsed = time.time() - start 
     print('Completed {0}/{1}  in {2} seconds: {3} ops/sec'.format(container.__name__,operation.__name__, elapsed, num/elapsed)) 

输出如下所示。

Completed deque/append  in 0.011004447937011719 seconds: 9087234.595718866 ops/sec 
Completed deque/appendleft  in 0.00800323486328125 seconds: 12494947.56911344 ops/sec 
Completed deque/pop  in 0.00800323486328125 seconds: 12494947.56911344 ops/sec 
Completed deque/popleft  in 0.009003400802612305 seconds: 11106914.175250906 ops/sec 
Completed list/append  in 0.011004447937011719 seconds: 9087234.595718866 ops/sec 
Completed list/appendleft  in 8.727489709854126 seconds: 11458.048456601553 ops/sec 
Completed list/pop  in 0.01900768280029297 seconds: 5261030.555416185 ops/sec 
Completed list/popleft  in 1.781712532043457 seconds: 56125.776858800775 ops/sec 

我要寻找一个很好的方式排列的数字seconds和ops/second。如何在这pythonI做有以下程序使用的是我从网上复制一个deque。

from collections import Counter,deque 
import re 
import time 
import my_ds 

num = 100000 

def append(c): 
    for i in range(num): 
     c.append(i) 

def appendleft(c): 
    if isinstance(c, deque): 
     for i in range(num): 
      c.appendleft(i) 
    else: 
     for i in range(num): 
      c.insert(0,i) 

def pop(c): 
    for i in range(num): 
     c.pop() 

def popleft(c): 
    if isinstance(c,deque): 
     for i in range(num): 
      c.popleft() 
    else: 
     for i in range(num): 
      c.pop(0) 


for container in [deque, list]: 
    for operation in [append, appendleft, pop, popleft]: 
     c = container(range(num)) 
     start = time.time() 
     operation(c) 
     elapsed = time.time() - start 
     print_list = [container.__name__,operation.__name__, elapsed, num/elapsed] 
     print(tabulate(print_list, headers = ['Container , Operation , Tile elapsed , ops/sec'], floatfmt=".8f")) 

我收到以下错误。

Traceback (most recent call last): 
    File "C:/playpen/python/concepts/data_structures/collections.py", line 66, in <module> 
    print(tabulate(print_list, headers = ['Container , Operation , Tile elapsed , ops/sec'], floatfmt=".8f")) 
    File "C:\Anaconda3\lib\site-packages\tabulate.py", line 894, in tabulate 
    list_of_lists, headers = _normalize_tabular_data(tabular_data, headers) 
    File "C:\Anaconda3\lib\site-packages\tabulate.py", line 649, in _normalize_tabular_data 
    rows = list(map(list,rows)) 
TypeError: 'float' object is not iterable 

Answer 1

你需要收集所有结果，然后一气呵成打印出来：

print_list = [] 
for container in [deque, list]: 
    for operation in [append, appendleft, pop, popleft]: 
     c = container(range(num)) 
     start = time.time() 
     operation(c) 
     elapsed = time.time() - start 
     print_list.append([container.__name__,operation.__name__, elapsed, num/elapsed]) 
print(tabulate(print_list, headers = ['Container , Operation , Tile elapsed , ops/sec'], floatfmt=".8f")) 

tabulate需要行的列表（这应该是值的列表）。您的旧版本试图迭代数字结果。