python built-in function: enumerate

enumerate(iterable, start=0)

返回一個列舉物件，其中包含計數值與迭代資料內容
常配合 for … in 結構來處理迭代資料

seasons = ['Spring', 'Summer', 'Fall', 'Winter']
print(list(enumerate(seasons)))
# [(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]

for x, y in enumerate(seasons):
    print(x, y)

# 0 Spring
# 1 Summer
# 2 Fall
# 3 Winter

seasons = ['Spring', 'Summer', 'Fall', 'Winter']

print(list(enumerate(seasons)))

# [(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]

for x, y in enumerate(seasons):

print(x, y)

# 0 Spring

# 1 Summer

# 2 Fall

# 3 Winter

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python built-in function: enumerate

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