import pandas as pd
# 创建示例DataFrame
data = {'column_name': ['A', 'B', 'A', 'C', 'A', 'B', 'D']}
df = pd.DataFrame(data)
# 统计某个值出现的次数
desired_value = 'A'
count = (df['column_name'] == desired_value).sum()
print(count)
3
import pandas as pd
# 创建示例DataFrame
data = {'column_name': ['A', 'B', 'A', 'C', 'A', 'B', 'D']}
df = pd.DataFrame(data)
# 统计某个值出现的次数
desired_value = 'A'
count = (df['column_name'] == desired_value).sum()
print(count)
3
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