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# 方法一
keys = ['name', 'gender', 'age']
dic = {}
for key in keys:
    dic[key] = None
print(dic)
# >>>{'name': None, 'gender': None, 'age': None}

# 方法二
dic1 = {}.fromkeys(keys, None)
print(dic1)
# >>>{'name': None, 'gender': None, 'age': None}

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gantt
dateFormat  YYYY-MM-DD
title Adding GANTT diagram to mermaid
excludes weekdays 2014-01-10

section A section
Completed task            :done,    des1, 2014-01-06,2014-01-08
Active task               :active,  des2, 2014-01-09, 3d
Future task               :         des3, after des2, 5d
Future task2               :         des4, after des3, 5d

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