Since I can’t access external links directly, I’ll cover common Python list conversion scenarios (based on the Gist title "Python list conversion") with examples:

1. String → List

Convert a string to a list of characters:

s = "hello"
char_list = list(s)  # ['h', 'e', 'l', 'l', 'o']

Convert a comma-separated string to a list of integers:

num_str = "1,2,3,4"
num_list = list(map(int, num_str.split(',')))  # [1,2,3,4]

2. Tuple → List

t = (10, 20, 30)
list_from_tuple = list(t)  # [10,20,30]

3. Set → List

Note: Sets are unordered, so the list order isn’t guaranteed.

s = {5, 3, 1}
list_from_set = list(s)  # [1,3,5] (order may vary)

4. Dictionary → List

• Keys: list(dict)
• Values: list(dict.values())
• Key-value pairs: list(dict.items())

Example:

d = {"a":1, "b":2}
keys = list(d)  # ['a', 'b']
values = list(d.values())  # [1, 2]
items = list(d.items())  # [('a',1), ('b',2)]

5. Generator → List

Convert a generator expression to a list:

gen = (x*2 for x in range(3))
list_from_gen = list(gen)  # [0,2,4]

6. Numpy Array → List

Use tolist() for numpy arrays:

import numpy as np
arr = np.array([1,2,3])
list_from_np = arr.tolist()  # [1,2,3]

7. Pandas Series → List

Use tolist() for pandas Series:

import pandas as pd
series = pd.Series([10,20,30])
list_from_series = series.tolist()  # [10,20,30]

8. Flatten Nested Lists

Convert a nested list to a flat list:

nested = [[1,2], [3,4], [5]]
# Method 1: Using sum()
flat = sum(nested, [])  # [1,2,3,4,5]
# Method 2: Using itertools.chain
from itertools import chain
flat = list(chain.from_iterable(nested))  # same result

If your Gist had a specific scenario (e.g., converting JSON to list, or a custom object), let me know and I can add that!

作者声明:本文包含人工智能生成内容。