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Wolfram Language Natural Language Processing

String manipulation not working

Faas Tubee

Posted 3 years ago

I have a for loop that iterates over an array of movies that a person has played in, and it outs that output together. This is the code: p = Interpreter["Person"]["Einstein"]; MovieAppearancesParsed = ""; MovieAppearances = EntityValue[p, "MovieAppearances"]; For[i = 0, i < Length[MovieAppearances], i++,MovieAppearancesParsed <>";;"<> ToString[EntityValue[Part[MovieAppearances, i],"Name"]]] Print[MovieAppearancesParsed] that doesn't work, MovieAppearancesParsed doesn't get changed at all I can, however, do this: p = Interpreter["Person"]["Einstein"]; MovieAppearancesParsed = "test"; MovieAppearances = EntityValue[p, "MovieAppearances"]; For[i = 0, i < Length[MovieAppearances], i++ ,Print[EntityValue[Part[MovieAppearances, i],"Name"]]] Print[MovieAppearancesParsed] but that prints this: " EntityValue[List,Name] Der ewige Jude Naqoyqatsi Trinity and Beyond: The Atomic Bomb Movie Atomic Power test " why can't I use the first approach? I can't use the last one, as I format the output and there is other stuff that I need to format with it.

I have a for loop that iterates over an array of movies that a person has played in, and it outs that output together. This is the code:

p = Interpreter["Person"]["Einstein"];
MovieAppearancesParsed = "";
MovieAppearances = EntityValue[p, "MovieAppearances"];
For[i = 0, i < Length[MovieAppearances], i++,MovieAppearancesParsed <>";;"<> ToString[EntityValue[Part[MovieAppearances, i],"Name"]]]
Print[MovieAppearancesParsed]

that doesn't work, MovieAppearancesParsed doesn't get changed at all I can, however, do this:

p = Interpreter["Person"]["Einstein"];
MovieAppearancesParsed = "test";
MovieAppearances = EntityValue[p, "MovieAppearances"];
For[i = 0, i < Length[MovieAppearances], i++ ,Print[EntityValue[Part[MovieAppearances, i],"Name"]]]
Print[MovieAppearancesParsed]

but that prints this: " EntityValue[List,Name] Der ewige Jude Naqoyqatsi Trinity and Beyond: The Atomic Bomb Movie Atomic Power test "

why can't I use the first approach? I can't use the last one, as I format the output and there is other stuff that I need to format with it.

POSTED BY: Faas Tubee

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Rohit Namjoshi

Posted 3 years ago

Hi Faas, MovieAppearancesParseddoesnt get changed at all Because there is no assignment to it in the loop Some beginner WL advice Avoid using symbol names that start with an uppercase letter, they are used by WL built-ins. Use functional constructs (e.g. `Map`) rather than procedural constructs (e.g. `For`). Decouple data collection and processing p = Interpreter["Person"]["Einstein"]; movieAppearances = EntityValue[p, "MovieAppearances"]; movieNames = #["Name"] & /@ movieAppearances (* {"Der ewige Jude", "Naqoyqatsi", "Trinity and Beyond: The Atomic Bomb Movie", "Atomic Power", "The Yellow Star – The Persecution of the Jews in Europe 1933–45"} ) Single `String` with names delimited by `;;` StringRiffle[movies, ";;"] ( Der ewige Jude;;Naqoyqatsi;;Trinity and Beyond: The Atomic Bomb Movie;;Atomic Power;;The Yellow Star – The Persecution of the Jews in Europe 1933–45 *)

Hi Faas,

MovieAppearancesParseddoesnt get changed at all

Because there is no assignment to it in the loop

Some beginner WL advice

Avoid using symbol names that start with an uppercase letter, they are used by WL built-ins.
Use functional constructs (e.g. Map) rather than procedural constructs (e.g. For).
Decouple data collection and processing

    p = Interpreter["Person"]["Einstein"];
    movieAppearances = EntityValue[p, "MovieAppearances"];

    movieNames = #["Name"] & /@ movieAppearances
    (*
    {"Der ewige Jude", "Naqoyqatsi", "Trinity and Beyond: The Atomic Bomb Movie", "Atomic Power", 
    "The Yellow Star – The Persecution of the Jews in Europe 1933–45"}
    *)

Single String with names delimited by ;;

StringRiffle[movies, ";;"]
(* Der ewige Jude;;Naqoyqatsi;;Trinity and Beyond: The Atomic Bomb Movie;;Atomic Power;;The Yellow Star – The Persecution of the Jews in Europe 1933–45 *)

POSTED BY: Rohit Namjoshi

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