Add multiple unknowns to a string in Pyton-CodePudding

I need to add to the line:

url="items.point&point1={item},{item}&point2C{item},{item}"

four values of possible coordinates instead of "item" value. We have to generate these coordinate values in a loop.

I tried many different options for how to do this, but the program displays a lot of extra values.

My code:

import numpy as np
coordinates=[]
for item in np.arange(45.024287,45.024295,0.000001):
    coordinates.append("%.6f" %item)
    for item in np.arange(45.024287,45.024295,0.000001):
        coordinates.append("%.6f" %item)
urls=[]
for item in (coordinates):
    urls.append(f"items.point&point1{item},{item}&point2={item},{item}")
print(urls)

I need to get this result:

"items.point&point1=45.024295,45.024295&point2=39.073557,45.005125","items.point&point1=45.024294,45.024294&point2=39.073557,45.005125"...Etc

With different coordinates

But I am getting repeated values due to the fact that the loop is in a loop. Can you tell me how you can substitute several variables in a string without doubling the values?Please

CodePudding user response：

I remember reading recently something related to your problem. Can't remember the post, else I'd link it, but I took notes about the beautiful method! So try this:

urls=[]
for item1, item2 in zip(*[iter(coordinates)]*2):
    urls.append(f"items.point&point1{item1},{item2}&point2=39.073557,45.005125")
print(urls)

CodePudding user response：

There's no need for the coordinates array. Just append to urls in the nested for loop to get all the combinations of item values.

for item1 in np.arange(45.024287,45.024295,0.000001):
    for item2 in np.arange(45.024287,45.024295,0.000001):
        urls.append(f"items.point&point1={item1},{item2}&point2=39.073557,45.005125")