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設計程式時出現以下錯誤，請協助修正：
AttributeError                            Traceback (most recent call last)
<ipython-input-8-b9d8f89049c4> in <cell line: 1>()
----> 1 a.upper()

AttributeError: 'int' object has no attribute 'upper'

請Debug以下程式:
a = 235 # integer
b = "two three five" # string
c = True # boolean
d = (2, 3, 5) # tuple
e = [2, 3, 5] # list
f = {"two": 2, "three": 3, "five": 5} # dictionary
type(f)
a.upper()

請解釋以下的程式碼：

from math import log2

count_new = 0
count_york = 0
count_new_york = 0

for i,tok in enumerate(tokens):
    if tok == "new":
        count_new += 1
        try:
            next_tok = tokens[i+1]
            if next_tok == "york":
                count_new_york += 1
        except IndexError:
            pass
    if tok == "york":
        count_york += 1

p_new = count_new / len(tokens)
p_work = count_york / len(tokens)
p_new_york = count_new_york / len(tokens)
pmi = log2(p_new_york / (p_new * p_work))
print("p_new =", p_new)
print("p_york =", p_work)
print("p_new_york =", p_new_york)
print("pmi =", pmi)

請為以下的程式碼加上註解：

from math import log2

count_new = 0
count_york = 0
count_new_york = 0

for i,tok in enumerate(tokens):
    if tok == "new":
        count_new += 1
        try:
            next_tok = tokens[i+1]
            if next_tok == "york":
                count_new_york += 1
        except IndexError:
            pass
    if tok == "york":
        count_york += 1

p_new = count_new / len(tokens)
p_work = count_york / len(tokens)
p_new_york = count_new_york / len(tokens)
pmi = log2(p_new_york / (p_new * p_work))
print("p_new =", p_new)
print("p_york =", p_work)
print("p_new_york =", p_new_york)
print("pmi =", pmi)

請改進以下程式碼：

from math import log2

count_new = 0
count_york = 0
count_new_york = 0

for i,tok in enumerate(tokens):
    if tok == "new":
        count_new += 1
        try:
            next_tok = tokens[i+1]
            if next_tok == "york":
                count_new_york += 1
        except IndexError:
            pass
    if tok == "york":
        count_york += 1

p_new = count_new / len(tokens)
p_work = count_york / len(tokens)
p_new_york = count_new_york / len(tokens)
pmi = log2(p_new_york / (p_new * p_work))
print("p_new =", p_new)
print("p_york =", p_work)
print("p_new_york =", p_new_york)
print("pmi =", pmi)

Please use traditional chinese in all the following response