投稿時間:2023-02-04 22:10:14 RSSフィード2023-02-04 22:00 分まとめ(13件)

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IT	気になる、記になる…	TwitterからMastodonへの移行を簡略化するサービス｢Movetodon｣がTwitterにブロックされる	https://taisy0.com/2023/02/04/168100.html	mastodon	2023-02-04 12:58:00
IT	気になる、記になる…	Anker、｢楽天お買い物マラソン｣で90製品以上を最大30％オフで販売するセールを開催中（2月11日まで）	https://taisy0.com/2023/02/04/168096.html	anker	2023-02-04 12:00:15
python	Pythonタグが付けられた新着投稿 - Qiita	主成分分析をイチから整理してみる	https://qiita.com/FallnJumper/items/536ab82b3f68382c575c	covxyxbarxybary	2023-02-04 21:40:37
js	JavaScriptタグが付けられた新着投稿 - Qiita	someメソッドで波括弧のなかに判定式がある場合はreturnが必要	https://qiita.com/Jun01t/items/098d72bea55ee969cf7c	rsomenumbergtnumberco	2023-02-04 21:45:34
AWS	AWSタグが付けられた新着投稿 - Qiita	Glueでcsvファイルをparquet形式に変換してみた	https://qiita.com/mochiS0/items/4ee709eafd1deb0e98bc	apacheparquet	2023-02-04 21:20:52
海外TECH	DEV Community	About "can only concatenate str (not “list”) to str" in Python	https://dev.to/lavary/about-can-only-concatenate-str-not-list-to-str-in-python-1j88	About quot can only concatenate str not “list to str quot in PythonUpdate This post was originally published on my blog decodingweb dev where you can read the latest version for a user experience rezaThe Python error “TypeError can only concatenate str not “list to str occurs if you concatenate a string with a list Here s what the error looks like on Python File dwd sandbox test py line in print Resources books TypeError can only concatenate str not list to strOn Python the error is slightly different though Traceback most recent call last File test py line in print Resources books TypeError cannot concatenate str and list objectsBut it occurs for the same reason Why does it happen As you probably know programming languages are either strongly typed or loosely typed Strongly typed programming languages such as Python have a strict type system to help the programmer avoid data type related mistakes meaning some operations aren t allowed on some data types For instance you can t divide by because is a string value depending on the operation the error messages might vary Whenever you declare a variable like name John as a dynamically typed language Python determines the data type to be a string Now if you try to concatenate it with a list you ll get the TypeError can only concatenate str not list to str error How to fix TypeError can only concatenate str not list to strFixing type errors such as this one is easy If you need to use the operator check if the operands on either side have the same type Remember birds of a feather flock together But if you want to insert the values into a string there are multiple ways of doing it Convert the list into a string value with the str join methodAccess list items individuallyUse print with multiple arguments ideal for debuggingUse an f stringUse printf style formattingLet s explore each method Convert the list into a string with the str join method If you want to concatenate the items of a list to a string value use str join like so books Fluent Python Head First Python output Resources join books print output output Resources Fluent Python Head First PythonIn the above code we separate the list items by a comma Please note we call the join method on the separator string in this case It seems weird but that s how it works Access list items individually Sometimes you need to concatenate a single list item with a string value but you use the whole list object by mistake In that case you need to access the item by its index books Fluent Python Head First Python output Top Pick books print output output Top Pick Head First PythonUse print with multiple arguments ideal for debugging If you re concatenating a string with a list and readability isn t a concern you can pass the string and the list as separate arguments to the print function All the positional arguments passed to the print function are automatically converted to strings like how str works books Fluent Python Head First Python print Fetched these books books output Fetched these books Fluent Python Head First Python As you can see the print function outputs the arguments separated by a space You can also change the separator via the sep keyword argument Use an f string Formatted string literals a k a f strings are a robust way of formatting strings because they allow you to use Python expressions directly in string values in a pair of curly brackets You create an f string by prefixing it with f or F and writing expressions inside curly braces books Fluent Python Head First Python print f Fetched these books books output Fetched these books Fluent Python Head First Python Additionally you can join the list items before using it in the string books Fluent Python Head First Python book list join books print f Fetched these books book list output Fetched these books Fluent Python Head First PythonUse printf style formatting In the old string formatting a k a printf style string formatting we use the modulo operator to generate dynamic strings string values The string operand is a string literal containing one or more placeholders identified with while the values operand can be a single value or a tuple of values books Fluent Python Head First Python print Fetched these books s books output Fetched these books Fluent Python Head First Python When using the old style formatting check if your format string is valid Otherwise you ll get another type error not all arguments converted during string formatting Alright I think that does it I hope this quick guide helped you fix your problem Thanks for reading ️You might like Not all arguments converted during string formatting error in Python Fixed TabError inconsistent use of tabs and spaces in indentation Python How to fix the TypeError unhashable type dict error in PythonHow to reverse a range in Python with examples TypeError missing required positional argument self Fixed Unindent does not match any outer indentation level error in Python Fixed	2023-02-04 12:49:59
海外ニュース	Japan Times latest articles	Kishida fires senior aide over homophobic comments	https://www.japantimes.co.jp/news/2023/02/04/national/politics-diplomacy/masayoshi-arai-japan-same-sex-marriage-hate/	commentsmasayoshi	2023-02-04 21:23:15
海外ニュース	Japan Times latest articles	China’s mega-rich move their wealth — and parties — to Singapore	https://www.japantimes.co.jp/news/2023/02/04/asia-pacific/wealthy-chinese-singapore/	China s mega rich move their wealth ーand parties ーto SingaporeSingapore is seeing an influx of ultra wealthy families from China looking to protect their wealth from a Communist Party that increasingly views them with suspicion	2023-02-04 21:16:15
海外ニュース	Japan Times latest articles	Yokohama F. Marinos goalkeeper Yohei Takaoka to join Vancouver in MLS	https://www.japantimes.co.jp/sports/2023/02/04/soccer/yohei-takaoka-vancouver-whitecaps/	Yokohama F Marinos goalkeeper Yohei Takaoka to join Vancouver in MLSThe year old Takaoka played all league matches in Marinos title winning campaign last year and was named among the J League Best XI for the	2023-02-04 21:08:37
ニュース	BBC News - Home	China urges calm over 'spy' balloon in US airspace	https://www.bbc.co.uk/news/world-us-canada-64521570?at_medium=RSS&at_campaign=KARANGA	america	2023-02-04 12:21:07
ニュース	BBC News - Home	Teenager dies after shark attack in Australian river	https://www.bbc.co.uk/news/world-australia-64523498?at_medium=RSS&at_campaign=KARANGA	australia	2023-02-04 12:45:34
ニュース	BBC News - Home	NHS chief: Strikes making hospital bosses restless	https://www.bbc.co.uk/news/health-64522093?at_medium=RSS&at_campaign=KARANGA	leaders	2023-02-04 12:08:06
ニュース	BBC News - Home	Cristiano Ronaldo scores late penalty for first Al Nassr goal in Saudi Arabia	https://www.bbc.co.uk/sport/av/football/64523053?at_medium=RSS&at_campaign=KARANGA	Cristiano Ronaldo scores late penalty for first Al Nassr goal in Saudi ArabiaCristiano Ronaldo scores an injury time penalty to register his first goal for Al Nassr and rescue a point against Al Fateh in the Saudi Pro League	2023-02-04 12:37:41