我創(chuàng)建了一個(gè)函數(shù)，它看起來(lái)像是一個(gè)矩陣，但是當(dāng)打印出來(lái)時(shí)，它沒(méi)有打印出矩陣中項(xiàng)目的正確位置。然而，用于顯示當(dāng)前所在行和列的打印功能確實(shí)打印了正確的值，但附加的這些值卻沒(méi)有。而不是打印：[00, 01, 02][10, 11, 12][20, 21, 22]它打?。篬20, 21, 22][20, 21, 22][20, 21, 22]我設(shè)法意識(shí)到它實(shí)際打印的是：[x0, x1, x2][x0, x1, x2][x0, x1, x2]其中 (x = rows - 1) 而不是它應(yīng)該的當(dāng)前行。我制作矩陣的腳本是：rows = 3cols = 3matrix = []def makeMatrix(rows, cols): curRow = [] for row in range(rows): curRow.clear() print("Row: ", row) for col in range(cols): print("Col: ", col) toAppend = str(row) + str(col) curRow.append(toAppend) matrix.append(curRow) printMatrix()def printMatrix(): for item in range(len(matrix)): print(matrix[item])makeMatrix(rows, cols)
3 回答
猛跑小豬
TA貢獻(xiàn)1858條經(jīng)驗(yàn) 獲得超8個(gè)贊
您將覆蓋您的curRow3 次，然后最后一個(gè)值將是該變量的值。如果你不想要這種行為，你需要像這樣克隆你的列表：
rows = 3
cols = 3
matrix = []
def makeMatrix(rows, cols):
curRow = []
for row in range(rows):
curRow.clear()
print("Row: ", row)
for col in range(cols):
print("Col: ", col)
toAppend = str(row) + str(col)
curRow.append(toAppend)
matrix.append(list.copy(curRow)) #Make a clone
printMatrix()
def printMatrix():
for item in range(len(matrix)):
print(matrix[item])
makeMatrix(rows, cols)
繁星淼淼
TA貢獻(xiàn)1775條經(jīng)驗(yàn) 獲得超11個(gè)贊
由于嵌套 for ，您正在覆蓋行。這就是為什么總是采用最新的數(shù)字。你可以這樣解決這個(gè)問(wèn)題：
rows = 3
cols = 3
matrix = []
def make_matrix(rows, cols):
for row in range(rows):
curRow = []
print("Row: ", row)
for col in range(cols):
print("Col: ", col)
toAppend = str(row) + str(col)
curRow.append(toAppend)
matrix.append(curRow)
print_matrix()
def print_matrix():
for item in range(len(matrix)):
print(matrix[item])
make_matrix(rows, cols)
我希望這有幫助。此外，我按照 PEP8 風(fēng)格為您的函數(shù)提供了更好的命名。
陪伴而非守候
TA貢獻(xiàn)1757條經(jīng)驗(yàn) 獲得超8個(gè)贊
如果您將行替換curRow.clear()為curRow = []您將獲得所需的輸出，如下所示：
>>>
('Row: ', 0)
('Col: ', 0)
('Col: ', 1)
('Col: ', 2)
('Row: ', 1)
('Col: ', 0)
('Col: ', 1)
('Col: ', 2)
('Row: ', 2)
('Col: ', 0)
('Col: ', 1)
('Col: ', 2)
['00', '01', '02']
['10', '11', '12']
['20', '21', '22']
這是在.下測(cè)試的Python 2.7。
Python 3.5在我得到相同結(jié)果的情況下實(shí)際測(cè)試您的原始代碼：
In [21]: makeMatrix(rows, cols)
Row: 0
Col: 0
Col: 1
Col: 2
Row: 1
Col: 0
Col: 1
Col: 2
Row: 2
Col: 0
Col: 1
Col: 2
['00', '01', '02']
['10', '11', '12']
['20', '21', '22']
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