天池龙珠计划 Python训练营

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• 天池龙珠计划 Python训练营
• 【Python入门系列】用Pandas揭秘美国选民的总统喜好

 

所记录的知识点

1. ndarray -> str

 

ndarray -> str

ndarray(str类型元素) -> str

# ndarray -> str
print("np.array(['1','2','3','544','5'])\n",np.array(['1','2','3','544','5']),"\n")
print("type(np.array(['1','2','3','544','5']))\n",type(np.array(['1','2','3','544','5'])),"\n")

print("np.array(['1','2','3','544','5']).tolist()\n",np.array(['1','2','3','544','5']).tolist(),"\n")
print("type(np.array(['1','2','3','544','5']).tolist())\n",type(np.array(['1','2','3','544','5']).tolist()),"\n")

print("\" \".join(np.array(['1','2','3','544','5']).tolist())\n"," ".join(np.array(['1','2','3','544','5']).tolist()),"\n")
print("type(\" \".join(np.array(['1','2','3','544','5']).tolist()))\n",type(" ".join(np.array(['1','2','3','544','5']).tolist())),"\n")

np.array(['1','2','3','544','5'])
 ['1' '2' '3' '544' '5'] 

type(np.array(['1','2','3','544','5']))
 <class 'numpy.ndarray'> 

np.array(['1','2','3','544','5']).tolist()
 ['1', '2', '3', '544', '5'] 

type(np.array(['1','2','3','544','5']).tolist())
 <class 'list'> 

" ".join(np.array(['1','2','3','544','5']).tolist())
 1 2 3 544 5 

type(" ".join(np.array(['1','2','3','544','5']).tolist()))
 <class 'str'> 

 

ndarray(int类型元素) -> str

# ndarray -> str
print("np.array([1,2,3,544,5])\n",np.array([1,2,3,544,5]),"\n")
print("type(np.array([1,2,3,544,5]))\n",type(np.array([1,2,3,544,5])),"\n")

print("np.array([1,2,3,544,5]).tolist()\n",np.array([1,2,3,544,5]).tolist(),"\n")
print("type(np.array([1,2,3,544,5]).tolist())\n",type(np.array([1,2,3,544,5]).tolist()),"\n")

print("\" \".join(str(i) for i in np.array([1,2,3,544,5]).tolist())\n"," ".join(str(i) for i in np.array([1,2,3,544,5]).tolist()),"\n")
print("type(\" \".join(str(i) for i in np.array([1,2,3,544,5]).tolist()))\n",type(" ".join(str(i) for i in np.array([1,2,3,544,5]).tolist())),"\n")

np.array([1,2,3,544,5])
 [  1   2   3 544   5] 

type(np.array([1,2,3,544,5]))
 <class 'numpy.ndarray'> 

np.array([1,2,3,544,5]).tolist()
 [1, 2, 3, 544, 5] 

type(np.array([1,2,3,544,5]).tolist())
 <class 'list'> 

" ".join(str(i) for i in np.array([1,2,3,544,5]).tolist())
 1 2 3 544 5 

type(" ".join(str(i) for i in np.array([1,2,3,544,5]).tolist()))
 <class 'str'> 

 

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