索引超出范围Python数值迭代

Question

I am a beginner in Python . While running the following code.

from array import *  
x=[]  
x[0]=.232  
for i in range(25):   
x[i+1]=1/[i+1]-5*x[i] 
end

I get an error:

x[0]=.232 IndexError: list assignment index out of range

Can someone help me sort this out

Answer 1

Your code has more errors, but in this particular case you are trying to access the first position ( x[0] ) of an empty array ( declared as x=[] )

The same error appears in the loop ( x[i+1] is index out of range since the array is empty ) and you have a syntax error, end is not a python keyword. Finally, the body of the loop should be indented.

Answer 2

x=[] makes an empty list so you can't call x[0], so make a list of 26 elements(you need all total 26 elements) all equal to zero for convenience,

 x=[0.0]*26

or

x=[0.0 for i in range(26)]

again [i+1] denotes a list and you cant do calculation with that make (i+1). also 1/(i+1) gives integer division make 1.0/(i+1) end is not a valid python function here, dont use it indente the next line under the for loop. final programme,

x=[0.0]*26  
x[0]=.232  
for i in range(25):   
    x[i+1]=1.0/(i+1)-5*x[i]