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If the frequency is uncertain, a warning will be printed. Parameters ---------- index : DatetimeIndex or TimedeltaIndex If passed a Series will use the values of the series (NOT THE INDEX). warn : bool, default True Returns ------- str or None None if no discernible frequency. Raises ------ TypeError If the index is not datetime-like. ValueError If there are fewer than three values. Examples -------- >>> idx = pd.date_range(start='2020/12/01', end='2020/12/30', periods=30) >>> pd.infer_freq(idx) 'D' r Nz>cannot infer freq from a non-convertible dtype on a Series of �dtypezJPeriodIndex given. Check the `freq` attribute instead of using infer_freq.)r@ z4cannot infer freq from a non-convertible index type )Zpandas� isinstancer Z_valuesr r rD �object� TypeError�hasattrr �_TimedeltaFrequencyInferer�get_freq�IndexZ DatetimeIndexZ Int64IndexZ Float64Index�type�_FrequencyInferer)�indexr@ �pd�valuesZinfererr9 r9 r: � infer_freq s4 rQ c @ s e Zd ZdZd0dd�dd�Zedd� �Zed d � �Zedd �d d ��Zedd �dd��Z dd �dd�Z edd� �Z edd� �Z edd� �Z edd� �Zdd � Zed d � �Zed d � �Zdd �d!d"�Zdd �d#d$�Zdd �d%d&�Zdd �d'd(�Zdd �d)d*�Zdd �d+d,�Zdd �d-d.�Zd/S )1rM z8 Not sure if I can avoid the state machine here TrC )r@ c C sd || _ |j| _t|d�r4|jd k r4t�| j|j�| _|| _t|�dk rNt d��| j j p\| j j | _ d S )N�tz� z(Need at least 3 dates to infer frequency) rN �asi8�i8valuesrH rR r Ztz_convert_from_utcr@ �len� ValueErrorZ_is_monotonic_increasingZ_is_monotonic_decreasing� is_monotonic)�selfrN r@ r9 r9 r: �__init__� s z_FrequencyInferer.__init__c C s t | j�S )N)r rU )rY r9 r9 r: �deltas� s z_FrequencyInferer.deltasc C s t | jj�S )N)r rN rT )rY r9 r9 r: � deltas_asi8� s z _FrequencyInferer.deltas_asi8)r6 c C s t | j�dkS )N� )rV r[ )rY r9 r9 r: � is_unique� s z_FrequencyInferer.is_uniquec C s t | j�dkS )Nr] )rV r\ )rY r9 r9 r: �is_unique_asi8� s z _FrequencyInferer.is_unique_asi8z str | Nonec C s� | j r| jjsdS | jd }|r2t|t�r2| �� S | jddgddgdddgfkrTdS | js^dS | j d }t|t �r�t d|t �S t|t �r�t d|t �S t|t �r�t d |t �S t|t�r�t d |t �S t|t�r�t d |t �S t d |�S dS ) z� Find the appropriate frequency string to describe the inferred frequency of self.i8values Returns ------- str or None Nr r] � �A ZBHr% r r! r" r# r$ )rX rN Z _is_uniquer[ � _is_multiple�_ONE_DAY�_infer_daily_rule� hour_deltasr_ r\ � _ONE_HOUR�_maybe_add_count� _ONE_MINUTE� _ONE_SECOND� _ONE_MILLI� _ONE_MICRO)rY �deltar9 r9 r: rJ � s* z_FrequencyInferer.get_freqc C s dd� | j D �S )Nc S s g | ] }|t �qS r9 )rc )�.0�xr9 r9 r: � <listcomp># s z0_FrequencyInferer.day_deltas.<locals>.<listcomp>)r[ )rY r9 r9 r: � day_deltas! s z _FrequencyInferer.day_deltasc C s dd� | j D �S )Nc S s g | ] }|t �qS r9 )rf )rm rn r9 r9 r: ro ' s z1_FrequencyInferer.hour_deltas.<locals>.<listcomp>)r[ )rY r9 r9 r: re % s z _FrequencyInferer.hour_deltasc C s t | j�S )N)r rU )rY r9 r9 r: �fields) s z_FrequencyInferer.fieldsc C s t | jd �S )Nr )r rU )rY r9 r9 r: � rep_stamp- s z_FrequencyInferer.rep_stampc C s t | j| jj�S )N)r rq rN Z dayofweek)rY r9 r9 r: r 1 s z&_FrequencyInferer.month_position_checkc C s& | j d d | j d }t|�d��S )Nr/ � r �i8)rq r �astype)rY Znmonthsr9 r9 r: �mdiffs4 s z_FrequencyInferer.mdiffsc C s t | jd �d��S )Nr/ rt )r rq ru )rY r9 r9 r: �ydiffs9 s z_FrequencyInferer.ydiffsc C s� | � � }|r:| jd }t| jj }|� d|� �}t||�S | �� }|r�| jd d }dddd�}t|| jjd }|� d|� �}t||�S | �� }|r�t|| jd �S | j r�| � � S | � � r�dS | � � } | r�| S d S ) Nr r3 rS rs � � )r r= r] r ) �_get_annual_rulerw r rr �monthrg �_get_quarterly_rulerv �_get_monthly_ruler^ �_get_daily_rule�_is_business_daily� _get_wom_rule) rY Z annual_ruleZnyearsr{ �aliasZquarterly_ruleZ nquarters�mod_dictZ monthly_ruleZwom_ruler9 r9 r: rd = s0 z#_FrequencyInferer._infer_daily_rulec C sN | j d t }|d dkr@t| j�� }d|� �}t||d �S td|�S d S )Nr � zW-r )r[ rc r rr �weekdayrg )rY �days�wdr� r9 r9 r: r~ ] s z!_FrequencyInferer._get_daily_rulec C sH t | j�dkrd S t t| jd ��dkr,d S | �� }ddddd��|�S )Nr] r r, r- r r+ )�cs�bs�ce�be)rV rw r rq r r8 )rY � pos_checkr9 r9 r: rz g s z"_FrequencyInferer._get_annual_rulec C sD t | j�dkrd S | jd d dks(d S | �� }ddddd��|�S ) Nr] r rS r) r( r r* )r� r� r� r� )rV rv r r8 )rY r� r9 r9 r: r| q s z%_FrequencyInferer._get_quarterly_rulec C s. t | j�dkrd S | �� }ddddd��|�S )Nr] r. ZBMSr r' )r� r� r� r� )rV rv r r8 )rY r� r9 r9 r: r} { s z#_FrequencyInferer._get_monthly_rulec C s~ | j ddgkrdS | jd �� }t�| jj�}t�|t�}t�|t� |� d�}t� |dk|dk@ |dk|dk@ |dk@ B �S )Nr] rS Fr r� � ) rp rN r� �np�diffrT Z floor_dividerc �modZcumsum�all)rY Z first_weekdayZshifts�weekdaysr9 r9 r: r � s z$_FrequencyInferer._is_business_dailyc C s~ t | jj�}t|�dkr d S t | jjd d �}||dk }t|�dksTt|�dkrXd S |d d }t|d }d|� |� �S )Nr] r� r� r zWOM-)r rN r� rV �dayr )rY r� Zweek_of_months�weekr� r9 r9 r: r� � s z _FrequencyInferer._get_wom_ruleN)T)�__name__� __module__� __qualname__�__doc__rZ r r[ r\ r^ r_ rJ rp re rq rr r rv rw rd r~ rz r| r} r r� r9 r9 r9 r: rM � s* . rM c @ s e Zd Zdd� ZdS )rI c C s | j r| �� S d S )N)r^ r~ )rY r9 r9 r: rd � s z,_TimedeltaFrequencyInferer._infer_daily_ruleN)r� r� r� rd r9 r9 r9 r: rI � s rI �int)�multr6 c C s | | dkS )Nr r9 )�usr� r9 r9 r: rb � s rb �float)�base�countr6 c C s4 |dkr,|t |�kst�t |�}|� | � �S | S d S )Nr] )r� �AssertionError)r� r� r9 r9 r: rg � s rg )r6 c C s2 |dks| dkrdS t | �} t |�}t|�rNt| �rFtt| �t|��S | dkS t|�r^| dkS t|�rn| dkS t|�r�| |ddddd d d d d h kS |dkr�| dkS |dkr�| dkS |dkr�| dkS |dkr�| dkS |d kr�| dkS |d k� r�| dkS |d k�r| dkS |d k�r| dkS |d k�r*| dkS dS dS )a Returns True if downsampling is possible between source and target frequencies Parameters ---------- source : str or DateOffset Frequency converting from target : str or DateOffset Frequency converting to Returns ------- bool NF> r# r" r r r! r% r r r r$ > r# r" r r r! r% r r r$ r r r r% r r! r" r# r$ > r# r" r r! r% r r$ > r# r" r r! r% r r$ > r# r" r! r% r r r$ > r# r" r! r% r r$ > r# r" r! r$ r > r# r$ r! r" > r# r$ r" > r# r$ > r$ )�_maybe_coerce_freq� _is_annual� _is_quarterly�_quarter_months_conformr � _is_monthly� _is_weekly)�source�targetr9 r9 r: � is_subperiod� sD r� c C sV |dks| dkrdS t | �} t |�}t| �rnt|�rDt| �t|�kS t|�rft| �}t|�}t||�S |dkS t| �r~|dkS t| �r�|dkS t| �r�|| ddddd d d d d h kS | dkr�|dkS | dkr�|dkS | dkr�|dkS | dk� r�|dkS | d k�r|dkS | d k�r|dkS | d k�r*|dkS | d k�r<|dkS | d k�rN|dkS dS dS )a Returns True if upsampling is possible between source and target frequencies Parameters ---------- source : str or DateOffset Frequency converting from target : str or DateOffset Frequency converting to Returns ------- bool NF> r# r" r r r! r% r r r r$ > r# r" r r r! r% r r r$ r r r r% r r! r" r# r$ > r# r" r! r% r r$ > r# r" r! r$ r > r# r$ r! r" > r# r$ r" > r# r$ > r$ )r� r� r r� r� r� r� )r� r� ZsmonthZtmonthr9 r9 r: �is_superperiod� sJ r� c C s$ | dk s t �t| t�r | j} | �� S )z�we might need to coerce a code to a rule_code and uppercase it Parameters ---------- source : str or DateOffset Frequency converting from Returns ------- str N)r� rE r Z rule_code�upper)�coder9 r9 r: r� 2 s r� )r� r� r6 c C s t | }t | }|d |d kS )NrS )r )r� r� ZsnumZtnumr9 r9 r: r� E s r� )�ruler6 c C s | � � } | dkp| �d�S )Nr zA-)r� � startswith)r� r9 r9 r: r� K s r� c C s$ | � � } | dkp"| �d�p"| �d�S )Nr zQ-r* )r� r� )r� r9 r9 r: r� P s r� c C s | � � } | dkp| dkS )Nr r' )r� )r� r9 r9 r: r� U s r� c C s | � � } | dkp| �d�S )Nr& zW-)r� r� )r� r9 r9 r: r� Z s r� )T)@� __future__r r? �numpyr� Zpandas._libs.algosr Zpandas._libs.tslibsr r Z pandas._libs.tslibs.ccalendarr r r r r Zpandas._libs.tslibs.fieldsr r Zpandas._libs.tslibs.offsetsr r r r Zpandas._libs.tslibs.parsingr Zpandas.util._decoratorsr Zpandas.core.dtypes.commonr r r Zpandas.core.dtypes.genericr Zpandas.core.algorithmsr rk rj ri rh rf rc r7 Z _need_suffix�_prefix�_m�key�_aliasZ_dr; rB rQ rM rI rb rg r� r� r� r� r� r� r� r� r9 r9 r9 r: �<module> s� H c 8:
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