Datawhale_day2

本章作业

1. 假设字符3750，字符900和字符648是句子的标点符号，请分析赛题每篇新闻平均由多少个句子构成？
2. 统计每类新闻中出现次数对多的字符

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题1 代码：

import pandas as pd
import os


data_set = os.path.join(os.getcwd(), "数据集\\train_set.csv\\train_set.csv")
print(data_set)
train_df = pd.read_csv(data_set, sep='\t')
sum_sentences, lines = 0, 0
for index, content in enumerate(train_df["text"]):
    num_array = content.split(" ")
    num_dict = {}
    lines += 1
    for key in num_array:
        num_dict[key] = num_dict.get(key, 0) + 1
    if "3750" not in num_dict.keys() and "900" not in num_dict.keys() and "648" not in num_dict.keys():
        sum_sentences += 1
    else:
        sum_sentences += num_dict["3750"] if "3750" in num_dict.keys() else 0 + num_dict["900"] if "900" in num_dict.keys() else 0 + num_dict["648"] if "648" in num_dict.keys() else 0
print(sum_sentences/lines)

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题2 思路：

使用dict计算每个字符出现的频率，选每一类中最大的即可