Iterate through list of dictionaries and print message-CodePudding

I have a list of dictionaries that looks similar to following:

points = [
{"callsign": "A001", "daily_points":10, "number":" 447774076621"},
{"callsign": "A002", "daily_points":5, "number":" 447958708481"}
]

I am trying to iterate through list to print message like: "Hi A001 you received 10 points today"

I have tried using following code:

for callsign, daily_points in points.items():
print(f"Hi {callsign} you recieved {daily_points} points today.")

But it returns: AttributeError: 'list' object has no attribute 'items'

What am I doing wrong?

CodePudding user response：

points is a list, not a dictionary. You have to loop through each element in the list, then read the dictionary. The code looks somehow like this:

for point in points:
    print(f"Hi {point['callsign']} you received {point['daily_points']} points today.")

CodePudding user response：

You can use str.format:

for point in points:
    print("Hi {callsign} you recieved {daily_points} points today.".format(**point))

Also since in python 3.6 dict's preserve order you can keep most your code just replace points.items() with map(dict.values, points):

for callsign, daily_points, *_ in map(dict.values, points):
    print(f"Hi {callsign} you recieved {daily_points} points today.")

CodePudding user response：

The variable 'points' is a list of dictionaries, not a dictionary itself. To loop over each dictionary in the list, you could:

points = [
{"callsign": "A001", "daily_points":10, "number":" 447774076621"},
{"callsign": "A002", "daily_points":5, "number":" 447958708481"}
]

for point in points:
    print(f"Hi {point['callsign']} you recieved {point['daily_points']} points today.")

This would iterate through the list, and print out the information in each dictionary.

CodePudding user response：

You can try this:

for point in points:
    callsign, daily_points, number = point['callsign'], point['daily_points'], point['number']
    print(f"Hi {callsign} you recieved {daily_points} points today.")

CodePudding user response：

You could iterate through every record in points and do this.

for i in range(len(points)):
    print(f"Hi {points[i]['callsign']} you recieved {points[i]['daily_points']} points today.")

Output

Hi A001 you recieved 10 points today.
Hi A002 you recieved 5 points today.

CodePudding user response：

The easiest solution looks like this:

for person in points:
    print(f"Hi {person['callsign']} you recieved {person['daily_points']} points today.")

Your solution is wrong because list does not have method items(), and it can not unpack dictionary keys like that.

CodePudding user response：

The problem is that you are iterating over points, that is a list and has no items attribute.

One approach is to use .format and pass the dictionary directly:

points = [
    {"callsign": "A001", "daily_points": 10, "number": " 447774076621"},
    {"callsign": "A002", "daily_points": 5, "number": " 447958708481"}
]

for d in points:
    print("Hi {callsign} you received {daily_points} points today.".format(**d))

Output

Hi A001 you received 10 points today.
Hi A002 you received 5 points today.

CodePudding user response：

you need to access the value with the key

for user in points:
    print(f"Hi {user['callsign']} you recieved {user['daily_points']} points today.")

CodePudding user response：

The problem is the items() method is for lists only, not for dictionaries. However, you could try something like this:

for dictionary in points:
    print(f"Hi {dictionary['callsign']} you recieved {dictionary['daily_points']} points today.")

Or you can use the get() method as follows:

for dictionary in points:
    print(f"Hi {dictionary.get('callsign')} you recieved {dictionary.get('daily_points')} points today.")

CodePudding user response：

You mix dict and list..

See below

points = [{
    "callsign": "A001",
    "daily_points": 10,
    "number": " 447774076621"
}, {
    "callsign": "A002",
    "daily_points": 5,
    "number": " 447958708481"
}]

for point in points:
    print(
        f'Hi {point.get("callsign")} you received {point.get("daily_points")} points today.'
    )

output

Hi A001 you received 10 points today.
Hi A002 you received 5 points today.