[英]Python Class: Lambda Name Error - Name not defined
I am a beginner in Python 3.6. 我是Python 3.6的初学者。 I'm trying to create a class called 'Week' which will perform certain operations & ultimately print the value of the variable 'avg_mon'.
我正在尝试创建一个名为“Week”的类,它将执行某些操作并最终打印变量'avg_mon'的值。
In order to calculate the value of 'avg_mon', I have used the anonymous function 'lambda'. 为了计算'avg_mon'的值,我使用了匿名函数'lambda'。
from datetime import datetime
from datetime import date
from operator import add
from operator import itemgetter
class Week():
blank_mon=[0]*24
sum_mon=blank_mon
count_mon=0
print ("Blank Monday: ",blank_mon)
#curr_mon=[1,0,2,0,3,0,4,0,5,0,3,0,3,0,2,0,1,0,2,0,1,0,1,0]
curr_mon=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
print ("Current Monday",curr_mon)
count_mon = count_mon + 1
print ("Monday Count:",count_mon)
sum_mon=list(map(add,sum_mon,curr_mon)) #Adds all the Mondays together for each hour
print ("Total sum of all Mondays::",sum_mon)
avg_mon = list(map(lambda w_mon: float(w_mon)/count_mon,sum_mon)) #Gets the average of the Mondays for each hour
print ("Average Monday::",avg_mon)
mon = Week()
When I execute the code, I get the following error. 当我执行代码时,我收到以下错误。 I do not see any spelling/naming errors in my code.
我的代码中没有看到任何拼写/命名错误。 I can't figure out the reason behind such an error.
我无法弄清楚这种错误背后的原因。
Blank Monday: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Current Monday [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
Monday Count: 1
Total sum of all Mondays:: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
Traceback (most recent call last):
File "C:\Users\Admin\Documents\GitHub\Doze\functest.py", line 27, in <module>
class Week():
File "C:\Users\Admin\Documents\GitHub\Doze\functest.py", line 40, in Week
avg_mon = list(map(lambda w_mon: float(w_mon)/count_mon,sum_mon)) #Gets the average of the Mondays for each hour
File "C:\Users\Admin\Documents\GitHub\Doze\functest.py", line 40, in <lambda>
avg_mon = list(map(lambda w_mon: float(w_mon)/count_mon,sum_mon)) #Gets the average of the Mondays for each hour
NameError: name 'count_mon' is not defined
You probably want to put some of this code into a constructor. 您可能希望将一些此代码放入构造函数中。 As written, it's all defined as part of the class, which is causing your problem:
count_mon
isn't in scope when the lambda
function is called. 如上所述,它都被定义为类的一部分,这会导致您的问题:
count_mon
lambda
函数时count_mon
不在范围内。
Move this code inside an __init__
function: 将此代码
__init__
函数中:
class Week():
def __init__(self):
blank_mon=[0]*24
sum_mon=blank_mon
count_mon=0
print ("Blank Monday: ",blank_mon)
#curr_mon=[1,0,2,0,3,0,4,0,5,0,3,0,3,0,2,0,1,0,2,0,1,0,1,0]
curr_mon=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
print ("Current Monday",curr_mon)
count_mon = count_mon + 1
print ("Monday Count:",count_mon)
sum_mon=list(map(add,sum_mon,curr_mon)) #Adds all the Mondays together for each hour
print ("Total sum of all Mondays::",sum_mon)
avg_mon = list(map(lambda w_mon: float(w_mon)/count_mon,sum_mon)) #Gets the average of the Mondays for each hour
print ("Average Monday::",avg_mon)
Here's the full explanation for why this happens: Accessing class variables from a list comprehension in the class definition 以下是为什么会发生这种情况的完整解释: 从类定义中的列表解析中访问类变量
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