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[英]How to combine multiple dictionaries in a list based on the given key columns?
[英]How to combine list of dictionaries based on key
使用此數據:
famous_quotes = [
{"full_name": "Isaac Asimov", "quote": "I do not fear computers. I fear lack of them."},
{"full_name": "Emo Philips", "quote": "A computer once beat me at chess, but it was no match for me at "
"kick boxing."},
{"full_name": "Edsger W. Dijkstra", "quote": "Computer Science is no more about computers than astronomy "
"is about telescopes."},
{"full_name": "Bill Gates", "quote": "The computer was born to solve problems that did not exist before."},
{"full_name": "Norman Augustine", "quote": "Software is like entropy: It is difficult to grasp, weighs nothing, "
"and obeys the Second Law of Thermodynamics; i.e., it always increases."},
{"full_name": "Nathan Myhrvold", "quote": "Software is a gas; it expands to fill its container."},
{"full_name": "Alan Bennett", "quote": "Standards are always out of date. That’s what makes them standards."}
]
我正在嘗試以以下格式打印數據:
“鼓舞人心的報價”-姓,名
到目前為止,這是我得到的:
quote_names = [k['full_name'] for k in famous_quotes]
quote = [i['quote'] for i in famous_quotes]
print(f"\"{quote[0]}\" - {quote_names[0]} ")
print(f"\"{quote[1]}\" - {quote_names[1]} ")
print(f"\"{quote[2]}\" - {quote_names[2]} ")
print(f"\"{quote[3]}\" - {quote_names[3]} ")
print(f"\"{quote[4]}\" - {quote_names[4]} ")
print(f"\"{quote[5]}\" - {quote_names[5]} ")
print(f"\"{quote[6]}\" - {quote_names[6]} ")
它以以下格式返回數據:
“我不怕計算機。我怕缺少計算機。” -艾薩克·阿西莫夫(Isaac Asimov)
這與我想要的非常接近,但是我確定這不是實現此目的的最佳方法。 另外,我不知道如何顛倒名字和姓氏(或分別訪問每個名字)。
謝謝!
使用帶有f
-string的循環來格式化字符串:
famous_quotes = [
{"full_name": "Isaac Asimov", "quote": "I do not fear computers. I fear lack of them."},
{"full_name": "Emo Philips", "quote": "A computer once beat me at chess, but it was no match for me at "
"kick boxing."},
{"full_name": "Edsger W. Dijkstra", "quote": "Computer Science is no more about computers than astronomy "
"is about telescopes."},
{"full_name": "Bill Gates", "quote": "The computer was born to solve problems that did not exist before."},
{"full_name": "Norman Augustine", "quote": "Software is like entropy: It is difficult to grasp, weighs nothing, "
"and obeys the Second Law of Thermodynamics; i.e., it always increases."},
{"full_name": "Nathan Myhrvold", "quote": "Software is a gas; it expands to fill its container."},
{"full_name": "Alan Bennett", "quote": "Standards are always out of date. That’s what makes them standards."}
]
for x in famous_quotes:
print(f"\"{x['quote']}\" - {' '.join(reversed(x['full_name'].split()))}")
# "I do not fear computers. I fear lack of them." - Asimov Isaac
# "A computer once beat me at chess, but it was no match for me at kick boxing." - Philips Emo
# "Computer Science is no more about computers than astronomy is about telescopes." - Dijkstra W. Edsger
# "The computer was born to solve problems that did not exist before." - Gates Bill
# "Software is like entropy: It is difficult to grasp, weighs nothing, and obeys the Second Law of Thermodynamics; i.e., it always increases." - Augustine Norman
# "Software is a gas; it expands to fill its container." - Myhrvold Nathan
# "Standards are always out of date. That’s what makes them standards." - Bennett Alan
一步步:
1. Each quote is stored as a dictionary in array.
2. Iterate over the array
3. we can access dictionary values by using key
4. get the qoute
5. get the full_name
6. split it on spaces "a b c ".split(' ') = ['a','b','c']
7. print the last element
8. print the all elements except last element
for single_qoute in famous_quotes:
full_name_split = single_qoute['full_name'].split(' ')
print(single_qoute['quote'],' -',full_name_split[-1],"".join(full_name_split[:-1]))
輸出:
I do not fear computers. I fear lack of them. - Asimov Isaac
A computer once beat me at chess, but it was no match for me at kick boxing. - Philips Emo
Computer Science is no more about computers than astronomy is about telescopes. - Dijkstra EdsgerW.
The computer was born to solve problems that did not exist before. - Gates Bill
Software is like entropy: It is difficult to grasp, weighs nothing, and obeys the Second Law of Thermodynamics; i.e., it always increases. - Augustine Norman
Software is a gas; it expands to fill its container. - Myhrvold Nathan
Standards are always out of date. That’s what makes them standards. - Bennett Alan
為什么不這樣:
>>> for _ in famous_quotes:
... print(f'"{_["quote"]}\" - {" ".join(_["full_name"].split(" ")[::-1])}')
"I do not fear computers. I fear lack of them." - Asimov Isaac
"A computer once beat me at chess, but it was no match for me at kick boxing." - Philips Emo
"Computer Science is no more about computers than astronomy is about telescopes." - Dijkstra W. Edsger
"The computer was born to solve problems that did not exist before." - Gates Bill
"Software is like entropy: It is difficult to grasp, weighs nothing, and obeys the Second Law of Thermodynamics; i.e., it always increases." - Augustine Norman
"Software is a gas; it expands to fill its container." - Myhrvold Nathan
"Standards are always out of date. That’s what makes them standards." - Bennett Alan
為了更好地理解,可以將其擴展為:
for _ in famous_quotes:
quote = _["quote"]
name_list = _["full_name"].split(" ")
reversed_name = " ".join(name_list[::-1]) # name_list[::-1] does the same of name_list.reverse() but instead of change the current list, it returns a new list
print(f'"{quote} - {reversed_name}')
或訂約給:
>>> [print(f'"{_["quote"]}\" - {" ".join(_["full_name"].split(" ")[::-1])}') for _ in famous_quotes]
警告您不需要列表理解所生成的列表。 因此,這可能被視為不良做法。
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