Question

我已经完成了代码挑战，其中之一是编写了一行代码，打印出先前的结果（我已经完成了）

print(str(year)*int(number))

但它也表示在每个返回值之间放置一个换行符。因此，例如var'year'返回一个int值，并且该int被打印出次数取决于用户输入的内容。

我只是不知道'\ n'在这行代码中的位置。

 print(str(year)*int(number))

Answer 1

您可以在print的各个参数之间打印一个分隔符，该分隔符将出现在它们之间而不是空格

print('a', 'b', sep='\n')

我们可以使用参数解压缩为number提供print多个参数，并用'\n'分隔它们

year = 2000
number = 5
print(*[year]*number, sep='\n')

打印

Answer 2

您可以使用一个简单的循环：

org.gradle.api.tasks.TaskExecutionException: Execution failed for task
':android:packageRelease'. 

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
        at java.lang.Thread.run(Thread.java:745)


Caused by: org.gradle.tooling.BuildException: Failed to read key
shaperecognisingreleasekey from store
  "C:\Users\Albrecht\Documents\Apps\ShapeRecognisingGame\android\release\android-release.apk":
  Invalid keystore format
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler$transform$2.invoke(BuildElements.kt:133)
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler$transform$2.invoke(BuildElements.kt:110)
        at kotlin.sequences.SequencesKt___SequencesKt$onEach$1.invoke(_Sequences.kt:1260)
        at kotlin.sequences.TransformingSequence$iterator$1.next(Sequences.kt:149)
        at kotlin.sequences.FilteringSequence$iterator$1.calcNext(Sequences.kt:109)
        at kotlin.sequences.FilteringSequence$iterator$1.hasNext(Sequences.kt:133)
        at kotlin.sequences.TransformingSequence$iterator$1.hasNext(Sequences.kt:153)
        at kotlin.sequences.SequencesKt___SequencesKt.toCollection(_Sequences.kt:633)
        at kotlin.sequences.SequencesKt___SequencesKt.toMutableList(_Sequences.kt:663)
        at kotlin.sequences.SequencesKt___SequencesKt.toList(_Sequences.kt:654)
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler.transform(BuildElements.kt:140)
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler.into(BuildElements.kt:115)
        at com.android.build.gradle.internal.scope.BuildElementActionScheduler.into(BuildElementActionScheduler.kt:32)
        at com.android.build.gradle.tasks.PackageAndroidArtifact.doFullTaskAction(PackageAndroidArtifact.java:393)
        at com.android.build.gradle.internal.tasks.IncrementalTask.taskAction(IncrementalTask.java:106)


Caused by: com.android.ide.common.signing.KeytoolException: Failed to
read key shaperecognisingreleasekey from store
  "C:\Users\Albrecht\Documents\Apps\ShapeRecognisingGame\android\release\android-release.apk":
  Invalid keystore format
        at com.android.ide.common.signing.KeystoreHelper.getCertificateInfo(KeystoreHelper.java:212)
        at com.android.build.gradle.internal.packaging.IncrementalPackagerBuilder.withSigning(IncrementalPackagerBuilder.java:161)
        at com.android.build.gradle.tasks.PackageAndroidArtifact.doTask(PackageAndroidArtifact.java:646)
        at com.android.build.gradle.tasks.PackageAndroidArtifact.splitFullAction(PackageAndroidArtifact.java:496)
        at com.android.build.gradle.tasks.PackageAndroidArtifact.lambda$doFullTaskAction$2(PackageAndroidArtifact.java:388)
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler$transform$$inlined$forEach$lambda$1.call(BuildElements.kt:121)
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler$transform$$inlined$forEach$lambda$1.call(BuildElements.kt:110)
        at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1424)
        at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
        at java.util.concurrent.ForkJoinTask.externalAwaitDone(ForkJoinTask.java:326)
        at java.util.concurrent.ForkJoinTask.doJoin(ForkJoinTask.java:391)
        at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:719)
        at com.android.ide.common.internal.WaitableExecutor.waitForAllTasks(WaitableExecutor.java:215)
        at com.android.build.gradle.internal.scope.BuildElements$ExecutorBasedScheduler.transform(BuildElements.kt:125)



Caused by: java.io.IOException: Invalid keystore format
        at sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:658)
        at sun.security.provider.JavaKeyStore$JKS.engineLoad(JavaKeyStore.java:56)
        at sun.security.provider.KeyStoreDelegator.engineLoad(KeyStoreDelegator.java:224)
        at sun.security.provider.JavaKeyStore$DualFormatJKS.engineLoad(JavaKeyStore.java:70)
        at java.security.KeyStore.load(KeyStore.java:1445)
        at com.android.ide.common.signing.KeystoreHelper.getCertificateInfo(KeystoreHelper.java:190)

默认情况下，这将插入for _ in range(number): print(year)-因为每次打印都是单独的命令，并且默认的\n参数适用于打印。

Patrick Haugh用打印命令参数end=\n击败了我50秒，该参数使您可以指定要在打印值之间放置的内容：

sep

这会在每个数字之间打印换行符-默认情况下，它会打印一个空格。

您可以将收集到的数字放在列表中，将列表分解为其元素，然后使用\ n分隔符进行打印：

print(1,2,3,4,sep="\n")

更多信息可以在

中找到

print(*objects, sep=' ', end='\n', file=sys.stdout, flush=False)文档。

卡在没有引号时插入换行符的位置

2 个答案: