Resolving the Unexpected punctuator Error in Python GraphQL Client Queries

Learn how to fix the common `Unexpected punctuator` error when passing variables in your Python GraphQL client. Explore our step-by-step guide to correct your query syntax!
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Understanding the Unexpected Punctuator Error in Python GraphQL Client

When working with GraphQL in Python, many new developers often encounter various syntax errors that can be confusing and frustrating. One common issue is the Unexpected punctuator error, which typically occurs when the GraphQL query is not structured correctly. In this guide, we will walk you through the problem, and provide a clear solution to fix the error when passing variables in your queries.

The Problem: Unexpected Punctuator Error

Code Example

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In this code snippet, you attempt to execute a GraphQL query while passing a variable for the contract. However, upon execution, you encounter the following error message:

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This error occurs because the GraphQL specification mandates that a query must start with a keyword such as query, mutation, or another valid identifier. In your original query, you are missing the query keyword at the start.

The Solution: Correct Syntax for GraphQL Queries

To resolve this error, you'll need to adjust your GraphQL query syntax to follow the proper structure. Here's how to do it:

Step 1: Add the query Keyword

When defining a GraphQL query, you need to explicitly state that you are performing a query. Modify your syntax as follows:

Revised Code Example

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Key Changes Explained

Inclusion of query: The line query($contract: String!) has been added, which indicates the beginning of your query and passes the expected variable type correctly.

Variable Type Update: Make sure to set the correct type for your variable. In this example, we've updated the type of contract from Int! to String! since Ethereum contract addresses are represented as strings.

Conclusion

By incorporating the query keyword and ensuring the variable types are accurately represented, you can effectively resolve the Unexpected punctuator error in your GraphQL client queries. Proper understanding of GraphQL query syntax is essential for successful data retrieval. Next time you encounter such errors, remember to review your syntax and make adjustments accordingly. Happy coding!