如何在指定值（1.）出现前拆分列表生成多个子列表？

Got it, let's tackle this problem step by step. You want to split your original list into sublists where each sublist starts with a 1., splitting right before every occurrence of 1. (we skip the first one since there's nothing before it to split from). Here's a straightforward Python implementation to do this:

Step-by-Step Code Implementation #

# Your original list
lst = [1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1., 0., 0., 1., 0., 0., 0., 0.]

# First, find all indices where the element is 1.
split_points = [index for index, value in enumerate(lst) if value == 1.]

# Split the original list into sublists using these indices
sublists = []
for i in range(len(split_points)):
    start_idx = split_points[i]
    # For all except the last sublist, end at the next split point
    if i < len(split_points) - 1:
        end_idx = split_points[i+1]
    # For the last sublist, end at the end of the original list
    else:
        end_idx = len(lst)
    sublists.append(lst[start_idx:end_idx])

# Print the result with clear labels like lst1, lst2, etc.
for num, sublist in enumerate(sublists, 1):
    print(f"lst{num} = {sublist}")

Output of the Code #

When you run this code, you'll get the following sublists (matching your expected structure, plus the additional sublists from the remaining 1. entries in your original list):

• lst1 = [1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
• lst2 = [1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
• lst3 = [1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
• lst4 = [1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
• lst5 = [1.0, 0.0, 0.0]
• lst6 = [1.0, 0.0, 0.0, 0.0, 0.0]

How It Works #

1. Identify Split Points: We use a list comprehension to collect all indices where the element is 1. — these are our starting points for each sublist.
2. Slice the List: We loop through each split point, creating a sublist from the current split point to the next one (or the end of the list for the last sublist).
3. Label and Print: Finally, we iterate over the resulting sublists and print them with sequential labels for clarity.

内容的提问来源于stack exchange，提问作者Divya R