如何从Python中减去字符串中的数字？

Question

我有一个数字列表：

输入P[i] = int(mycsv[i][5]) # Obtaining my string "P" including 10 int values

输出{1: 3, 2: 2, 3: 2, 4: 5, 5: 4, 6: 5, 7: 4, 8: 3, 9: 2, 10: 5}

输入d = int(mycsv[1][10]) # Obtaining my number "1", even though it is trivial

输出1

我只需要创建另一个名为＆＃34; c_i＆＃34;的字符串。应该这么简单：

for i in range(1,11):
    c_i[i] = P[i] - d

但是，这不起作用。显然，Python比Matlab更奇怪。任何帮助表示赞赏！

Answer 1

您必须先创建字符串。尝试

c_i = ""
for i in range(1,11):
    c_i += P[i] - d

希望这有帮助。