python讀取csv檔案

csv格式資料

import csv

直接寫入csv檔案;

寫入：一條或者多條資料

import csv

header = ['line1','line2','line3']
rows = [[1,2,3],[4,5,6],[7,8,9]]
with open('test.csv','w') as f:
file = csv.writer(f)
file.writerow(header)
file.writerows(rows)

寫入：包括寫入頭部，寫入字典型別內容

import csv

header = ['line1','line2','line3']
rows = ,,}
with open('dict.csv','w', newline='') as f:
file = csv.dictwriter(f,header)
file.writeheader()
file.writerows(rows)

# 列印所有結果:

import csv
def readfilerows():
with open('test.csv','r') as f:
file = csv.reader(f)
for line in file:
print(line)
readfile()
# 如下型別結果：
['ip位址', '埠', '位址']
['115.53.18.58', '9999', '河南濮陽']
['218.91.112.161', '9999', '江蘇揚州']
['117.91.132.152', '9999', '江蘇揚州']
['114.230.69.167', '9999', '江蘇揚州']
['112.85.166.122', '9999', '江蘇南通']
['116.208.55.163', '9999', '湖北襄陽市宜城']
['222.189.190.187', '9999', '江蘇揚州']
['116.208.11.181', '9999', '湖北襄陽']
['180.119.141.239', '9999', '江蘇揚州']
# 列印第乙個字段：
def readfileitem():
with open('test.csv','r') as f:
file = csv.reader(f)
for line in file:
print(line[0])
readfile()
# 如下結果：
# ip位址
115.53.18.58
218.91.112.161
117.91.132.152
114.230.69.167
112.85.166.122
116.208.55.163
222.189.190.1

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