代码示例:
#读取CSV
import pandas as pd
df1 = pd.read_csv('test.csv')
print(df1)
'''
打印:
userId score age
0 1 45 18
1 2 65 19
2 3 58 17
3 4 92 16
4 5 78 18
'''
#获取一列,即Series数据获取
series1 = df1['score']
print(series1)
'''
打印:
0 45
1 65
2 58
3 92
4 78
Name: score, dtype: int64
'''
#获取索引值
print(series1.index) #打印:RangeIndex(start=0, stop=5, step=1)
print(series1.index.tolist()) #打印:[0, 1, 2, 3, 4]
#设置索引值
series1.index = list('abcde')
print(series1)
'''
打印:
a 45
b 65
c 58
d 92
e 78
Name: score, dtype: int64
'''
# 获取内容,series[索引值] | series[位置值]
print('索引下标',series1['d']) #打印:索引下标 92
print('位置下标',series1[3]) #打印:位置下标 92
#获取多个值
print(series1[['a','d']])
'''
打印:
a 45
d 92
Name: score, dtype: int64
'''
print(series1[[0,3]])
'''
打印:
a 45
d 92
Name: score, dtype: int64
'''
#Series切片
print(series1['a':'d']) # 如果使用索引下标,左右都闭合
'''
打印:
a 45
b 65
c 58
d 92
Name: score, dtype: int64
'''
print(series1[0:4]) #如果使用位置下标,左闭右开
'''
打印:
a 45
b 65
c 58
d 92
Name: score, dtype: int64
'''