我需要使用 doctest 测试以下代码。我必须是 doctest 而不是任何其他方法。我不断收到“预期：没有”。有没有办法做到这一点？
import pickle
#Loading lists from file using the pickle module
with open('stocklist.txt', 'rb') as f: #Reading the list of stock from a text file. "rb" or "read binary" is used
thelist = pickle.load(f)
def showstocklist(): #Defining a function for viewing the all information about the current items in the list
""" This function displays complete information about every item in stock.
Each item is diplayed in the form:
Software Name Sofware Medium Copies Available Supplier Index Number of Item
>>> showstocklist()
This is the current list of software available in stock:
----------------------------------------------------------------------------------------------------------
Ms Office Medium = CD Copies Available = 7 Supplier = Microsoft Index Number = 0
----------------------------------------------------------------------------------------------------------
Norton Antivirus Medium = DVD Copies Available = 24 Supplier = Symantec Index Number = 1
----------------------------------------------------------------------------------------------------------
Paint Medium = DVD Copies Available = 12 Supplier = The Eagle Company Index Number = 2
----------------------------------------------------------------------------------------------------------
"""
print("")
print("This is the current list of software available in stock:")
print("")
print("----------------------------------------------------------------------------------------------------------")
for (index,[item,medium,quantity,supplier]) in enumerate(thelist): #Displaying all item information from list along with their index number
print (str(item), " Medium = " + str(medium), " Copies Available = " + str(quantity), " Supplier = " + str(supplier), " Index Number = " + str(index))
print("----------------------------------------------------------------------------------------------------------")
if __name__ == "__main__":
import doctest
doctest.testmod(verbose = True)