exception异常

# try:
    # print(5/0)
# except ZeroDivisionError:
    # print("You can't divide by zero.")

# print("Give me two numbers, and I'll divide them.")
# print("Enter 'q' to exit.")

# while True:
    # first_number = input("\nFirst number:")
    # if first_number == 'q':
        # break;
        
    # second_number = input("\nSecond number:")
    # if second_number == 'q':
        # break;
    
    # answer = int(first_number) / int(second_number)
    # print(answer)
    
# print("Give me two numbers, and I'll divide them.")
# print("Enter 'q' to exit.")

# while True:
    # first_number = input("\nFirst number:")
    # if first_number == 'q':
        # break;
    
    # second_number = input("\nSecond number:")
    # if second_number == 'q':
        # break;
    
    # try:
        # answer = int(first_number) / int(second_number)
    # except ZeroDivisionError:
        # print("You can't divide by 0!")
    # else:
        # print(answer)

# filename = 'alice.txt'
# try:
    # with open(filename) as f_object:
        # contents = f_object.read()
# except FileNotFoundError:
    # msg = "Sorry, the file " + filename + " does not exist."
    # print(msg)

# title = "Alice in Wonderland"
# print(title.split())

# filename = "alice.txt"

# try:
    # with open(filename) as f_obj:
        # contents = f_obj.read()
# except FileNotFoundError:
    # msg = "Sorry, the file " + filename + " does not exist."
    # print(msg)
# else:
    # words = contents.split()
    # num_words = len(words)
    # print("The file " + filename + " has about " + str(num_words) + " words.")

# print("----")
# def count_words(filename):
    # try:
        # with open(filename) as f_obj:
            # contents = f_obj.read()
    # except FileNotFoundError:
        # print("Sorry, the file " + filename + " does not exist.")
    # else:
        # words = contents.split()
        # num_words = len(words)
        # print("The file " + filename + " has about " + str(num_words) + " words.")

# filename = "alice.txt"
# count_words(filename)
# filename = "alice2.txt"
# count_words(filename)

# file_names = ["alice.txt", "siddhartha.txt", "moby_dick.txt", "little_women.txt"]

# for filename in file_names:
    # count_words(filename)

print("----")
def count_words(filename):
    try:
        with open(filename) as f_obj:
            contents = f_obj.read()
    except FileNotFoundError:
        pass
    else:
        words = contents.split()
        num_words = len(words)
        print("The file " + filename + " has about " + str(num_words) + " words.")

file_names = ["alice.txt", "siddhartha.txt", "moby_dick.txt", "little_women.txt"]

for filename in file_names:
    count_words(filename)

# print("====")    
# try:
    # first_number = input("Please input a number:")
    # first_number = int(first_number)
    
    # second_number = input("Please input another number:")
    # second_number = int(second_number)
    
    # result = first_number + second_number
# except:
    # print("Please input correct number type.")
# else:
    # print("result:" + str(result))

# print("====")    
# while True:
    # try:
        # first_number = input("Please input a number('q' to quit):")
        # if first_number == 'q':
            # break;
        # first_number = int(first_number)
        
        # second_number = input("Please input another number('q' to quit):")
        # if second_number == 'q':
            # break;
        # second_number = int(second_number)
        
        # result = first_number + second_number
    # except:
        # print("Please input correct number type.")
    # else:
        # print("result:" + str(result))

# print("====")
# try:
    # filename_dog = "dogs.txt"
    # filename_cat = "cats.txt"
    
    # with open(filename_dog) as f_obj:
        # lines = f_obj.readlines();
        # print(lines)
    
    # with open(filename_cat) as f_obj:
        # lines = f_obj.readlines();
        # print(lines)
        
# except FileNotFoundError:
    # print("File not found.")
    
# print("====")
# try:
    # filename_dog = "dogs.txt"
    # filename_cat = "cats.txt"
    
    # with open(filename_dog) as f_obj:
        # lines = f_obj.readlines();
        # print(lines)
    
    # with open(filename_cat) as f_obj:
        # lines = f_obj.readlines();
        # print(lines)
        
# except FileNotFoundError:
    # pass
    
print("====")
filename = "moby_dick.txt"
with open(filename) as f_obj:
    contents = f_obj.read()
    cnt = contents.lower().count('row')
    print(cnt)