[英]Write every nth line from list to new row in csv file
我有一個列表,其中包含這樣的數字:
[20.5, 21.7, 23.0, 23.6, 24.0, 24.7]
我想將列表寫入 csv 文件,該文件應如下所示:
20.5, 21.7
23.0, 23.6
24.0, 24.7
所以我列表中的每一行都應該寫入 csv 文件的下一行。
現在我的腳本看起來像這樣:
import csv
with open('result.csv','w') as f:
for line in my_list:
f.write("%s\n" % line)
我怎樣才能只將第 n 行寫為新行,將每 n 行寫為新行?
如果您不需要逗號后的空格:
import csv
data = [20.5, 21.7, 23.0, 23.6, 24.0, 24.7]
with open('result.csv','w') as file:
csv.writer(file).writerows(data[i:i + 2] for i in range(0, len(data), 2))
否則:
with open('result.csv','w') as file:
file.writelines(
", ".join(map(str, data[i:i + 2])) + "\n" for i in range(0, len(data), 2)
)
這是一種不使用任何庫的簡單方法。
import csv
my_list = [20.5, 21.7, 23.0, 23.6, 24.0, 24.7]
nth_line = 2 #--> You can give other values too.
with open('result.csv','w') as f:
for line in range(len(my_list)):
f.write(str(my_list[line]))
if (line+1) % nth_line == 0:
f.write('\n')
else:
f.write(', ')
通過重塑列表,然后一次寫入:
import csv
data = [20.5, 21.7, 23.0, 23.6, 24.0, 24.7]
data = [data[x:x+2] for x in range(0, len(data), 2)]
with open("results.csv", "w") as f:
writer = csv.writer(f)
writer.writerows(data)
這也將表示奇數長度:
# len = 7
data = [20.5, 21.7, 23.0, 23.6, 24.0, 24.7, 0]
results.csv
20.5,21.7
23.0,23.6
24.0,24.7
0
我提出了適用於所有情況的解決方案:
from math import *
my_list = [20.5, 21.7, 23.0, 23.6, 24.0, 24.7]
values_per_line = 2
with open('result.csv','w') as f:
i = 0
number_of_lines = ceil(len(my_list)/values_per_line)
for line in range(number_of_lines):
for value in range(values_per_line):
if i < len(my_list)-1:
if value == (values_per_line - 1):
f.write("%s" % my_list[i])
else:
f.write("%s, " % my_list[i])
elif i == len(my_list)-1:
f.write("%s" % my_list[i])
i = i + 1
if line != number_of_lines-1:
f.write("\n")
您可以將 values_per_line 更改為您需要的任何值。
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