[英]Writing List to a csv file in Python
我目前正在使用Python v2.10。 我在將數據寫入csv文件時遇到問題。 想知道是否有人可以告訴我我做錯了什么。 我收到以下錯誤: "TypeError: list indices must be integers, not tuple"
-不確定如何更正此錯誤。 另外,我還想寫一個csv文件,數據必須是字符串格式?
理想情況下,我希望每一行都是這樣:Name,X1,Y1,X2,Y2,X3,Y3
這是我的代碼:
import csv
def main():
my_coords = open('Geo_Coords.csv', 'a')
coords = csv.reader(my_coords)
how_many = raw_input("How many Geometries do you wish to enter? ")
counter = 0
coords = []
while counter < how_many:
geometry = raw_input("Geometry Name ")
first_coordE = raw_input("1st Co-ord (Easting) ")
first_coordN = raw_input("1st Co-ord (Northing) ")
sec_coordE = raw_input("2nd Co-ord (Easting) ")
sec_coordN = raw_input("2nd Co-ord (Northing) ")
third_coordE = raw_input("3rd Co-ord (Easting) ")
third_coordN = raw_input("3rd Co-ord (Northing) ")
counter = counter + 1
my_coords.write(coords[[geometry],[first_coordE,first_coordN], [sec_coordE,sec_coordN], [third_coordE,third_coordN]] )
my_coords.close()
print my_coords
main()
您的代碼包含一些問題,在它是csv
對象之前將坐標重新分配為列表,您使用的是csv.reader
而不是csv.writer
,我建議您在此處閱讀文檔: https : csv.writer
/2/library/csv.html
也許這可以幫到您,我保留了您使用的結構,我只是做了一點修改。
import csv
def main():
with open('Geo_Coords.csv', 'a') as my_coords:
coords = csv.writer(my_coords)
how_many = int(raw_input("How many Geometries do you wish to enter? "))
# TODO: Check user input
rows = []
for _ in range(how_many):
geometry = raw_input("Geometry Name ")
first_coordE = raw_input("1st Co-ord (Easting) ")
first_coordN = raw_input("1st Co-ord (Northing) ")
sec_coordE = raw_input("2nd Co-ord (Easting) ")
sec_coordN = raw_input("2nd Co-ord (Northing) ")
third_coordE = raw_input("3rd Co-ord (Easting) ")
third_coordN = raw_input("3rd Co-ord (Northing) ")
rows.append([geometry, first_coordE,
first_coordN, sec_coordE,
sec_coordN, third_coordE,
third_coordN])
coords.writerows(rows)
if __name__ == "__main__":
main()
import csv
def main():
my_coords = open('Geo_Coords.csv', 'a')
coords = csv.reader(my_coords)
OK, coords
是csv.reader()
對象的名稱
how_many = raw_input("How many Geometries do you wish to enter? ")
字符串的名稱是how many
,請說"15"
counter = 0
coords = []
在這里,您做了一件奇怪的事情, coords
現在是一個空列表的名稱,而csv.reader()
不再有引用它的名稱了。
while counter < how_many:
上面的陳述也很奇怪...您正在將int與字符串進行比較! 在Python 2中,邏輯表達式string < integer
始終為True
!
geometry = raw_input("Geometry Name ")
first_coordE = raw_input("1st Co-ord (Easting) ")
first_coordN = raw_input("1st Co-ord (Northing) ")
sec_coordE = raw_input("2nd Co-ord (Easting) ")
sec_coordN = raw_input("2nd Co-ord (Northing) ")
third_coordE = raw_input("3rd Co-ord (Easting) ")
third_coordN = raw_input("3rd Co-ord (Northing) ")
counter = counter + 1
到目前為止,還不錯,但請注意,您尚未修改coords
的值,因此,當您使用名稱coords
您只是在引用一個空列表
my_coords.write(coords[[geometry],[first_coordE,first_coordN], [sec_coordE,sec_coordN], [third_coordE,third_coordN]] )
在這里,您通過尋址來引用一個空列表的內容; 此外,該地址的語法是錯誤的,它必須是整數或切片對象 -此外, .write(...)
方法需要一個字符串,而您正在嘗試一次寫入一個字符串列表...
my_coords.close()
print my_coords
這將打印類似
<closed file 'Geo_Coords.csv', mode 'a' at 0x7efc8946a540>
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