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q4_1.py

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+
+import json
+import matplotlib.pyplot as plt
+
+with open("books.json", "r", encoding="utf-8") as f:
+    data = json.load(f)
+books = data["books"]
+pub_count = {}
+for book in books:
+    pub_name = book["publisher"]
+    if pub_name in pub_count:
+        pub_count[pub_name] += 1
+    else:
+        pub_count[pub_name] = 1
+publish_names = list(pub_count.keys())
+book_nums = list(pub_count.values())
+plt.figure(figsize=(10, 6))
+plt.bar(pub_count.keys(), pub_count.values())
+plt.title("出版社图书数量分布", fontsize=14)
+plt.xlabel("出版社名称", fontsize=12)
+plt.ylabel("图书数量", fontsize=12)
+plt.xticks(rotation=45, ha="right")
+plt.tight_layout()
+
+plt.savefig("q4_1_bar.png", dpi=150)
+plt.show()