“TypeError：列表索引必须是整数或切片，而不是 str”

Question

Trying to complete a data analysis homework asignment, but constantly getting the same error despite several attempts

Some help would be greatly appreciated. The following is my code:

def is_valid_duration(duration_as_string):
try:
    duration = str(duration_as_string)
except ValueError:
    return False
else:
    duration = duration.strip("''")
    duration = duration.strip("`")
    return float(duration) > 10

filepath = "ufo-sightings.csv"


sightings_us = [row for row in ufosightings_count if row["country"] == "us" ]
fball = [row for row in sightings_us if (is_valid_duration(row["duration (seconds)"])) and (row["shape"] == "fireball")]

print(fball["datetime"], fball["state"])

the error I'm getting is this:

TypeError Traceback (most recent call last) in 28 fball = [row for row in sightings_us if (is_valid_duration(row["duration (seconds)"])) and (row["shape"] == "fireball")] 29 ---> 30 print(fball["datetime"])

TypeError: list indices must be integers or slices, not str

Answer 1

I guess row is some kind of dictionary with strings as keys. fball is a list of rows (not a dictionary as row), so fball needs an integer or slice as index, not a string. So you can do

for row in fball:
   print(row["datetime"], row["state"])

or

for ix in range(len(fball)):
  print(fball[ix]["datetime"],fball[ix]["state"]