问题
I have a list of tuples saved into a string (unfortunately). I am looking for a fast an efficient way to convert this string to an actual list of tuples.
Example:
mylist_string = '[(40.7822603, -73.9525339), (40.7142, -74.0087), (40.7250027, -73.9413106), (40.703422, -73.9862948), (40.7169963, -74.0149991), (40.7420448, -73.9918131), (40.7287, -73.9799), (40.7757237, -73.9492357), (40.7169904, -73.9578252), (40.726103, -73.9780367), (40.7776792, -73.9585829), (40.6750972, -73.9679734), (40.6867687, -73.9743078), (40.6684762, -73.9755826), (40.7169, -73.9578), (40.6996798, -73.9291393), (40.6680182, -73.9809183), (40.7346, -74.0073), (40.6871087, -73.9741862), (40.7160416, -73.9452393), (40.7178984, -74.0063829)]'
the expected output is a list of tuples in Python.
Thanks
回答1:
This is one way:
import ast
ast.literal_eval(mystr)
# [(40.7822603, -73.9525339),
# (40.7142, -74.0087),
# (40.7250027, -73.9413106),
# (40.703422, -73.9862948),
# ...
# (40.6871087, -73.9741862),
# (40.7160416, -73.9452393),
# (40.7178984, -74.0063829)]
回答2:
eval(mylist_string)
This will evaluate your string as if you typed it in Python.
Edit: this is an answer to the question, but it is not a good answer. There are security risks and it might not do what you think it does. So don't use eval, use:
import ast
ast.literal_eval(mystr)
See [this SO question] for a detailed comparison.
来源：https://stackoverflow.com/questions/48715893/how-to-convert-a-string-of-a-list-of-tuples-to-a-python-list-of-tuples