我想撰寫一組回圈遍歷串列串列，如下所示。
pathways = ['pathway_1','pathway_2']
pathway_1 = ['gene_A', 'gene_B']
pathway_2 = ['gene_C', 'gene_D']
for i in pathways:
for ii in i:
print(ii)
我希望輸出如下所示：
gene_A
gene_B
gene_C
gene_D
但目前生成這個：
p
a
t
h
w
a
y
_
1
p
a
t
h
w
a
y
_
2
有沒有簡單的方法來實作這一目標？
uj5u.com熱心網友回復：
在外部回圈中，您回圈的是字串而不是串列，請像這樣更改代碼：
pathway_1 = ['gene_A', 'gene_B']
pathway_2 = ['gene_C', 'gene_D']
pathways = [pathway_1, pathway_2]
for i in pathways:
for ii in i:
print(ii)
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